SF Bay Area Events: September 28–October 4, 2026
A ranked shortlist of 19 verified Bay Area AI, startup, robotics and builder events for September 28 to October 4, with direct registration links, quality signals and access friction stated up front.
San Francisco's week of September 28 to October 4 belongs to one conference and one evening. The AI Conference runs three days from Tuesday, September 29 at Pier 48 in Mission Rock, with more than 120 speakers across seven tracks, and the after-hours programming has arranged itself around it — a rooftop party at KAIYŌ, a Stripe fraud session in South San Francisco, a design night from Ramp, all built for the week the conference is in town. Wednesday, September 30 is the densest day of the month: seven separate rooms in this issue, on top of day two of the conference itself.
Four of them were already closed when every registration was checked on Sunday, September 27: the Agentic Growth Summit at the Computer History Museum, Foresight Institute's salon at The Fold, Anthropic and Cerebras's evening at Cafe Compute, and Supabase Select's curated Friday. Applications are again the norm on the strongest nights, so file the ones that need review today. The rooms where a free RSVP is still all you need are Wednesday's infrastructure talks and Saturday's hackathon.
The week at a glance
Ranking weighs topic relevance first, then evidence of quality: who is hosting, whether a programme or speaker list is published, how selective the room is, and whether registration is still open. Every date, time and venue below comes from the event's own page. Times are Pacific Daylight Time, and registration status is what each event page reported on September 27.
| Rank | Event | When | Where | Category | Entry | Status and access |
|---|---|---|---|---|---|---|
| 1 | The AI Conference 2026 | Tue, Sep 29–Thu, Oct 1, 9:00 AM–6:00 PM | Pier 48, Shed A and B, Mission Rock, San Francisco | AI conference | Ticketed | Tickets on sale. Three days, seven tracks, 120+ speakers and a workshop day capped at 350 people. Confirmed speakers include Peter Norvig of Stanford HAI and Ann Miura-Ko of Floodgate. 1 |
| 2 | Startup Speedrun Hackathon | Mon, Sep 28, 9:00 AM–5:00 PM | Cloudflare HQ, 101 Townsend St, San Francisco | Hackathon | Free / Application and approval | Registration open, 73 registered. Eight hours to take an idea as far as it goes, across agentic payments, agents that deploy infrastructure, and autonomous organizations. $27,500+ in prizes. 2 |
| 3 | The AI Conference Hack Day 2026 | Tue, Sep 29, 9:30 AM–7:00 PM | San Francisco; street address not published | Hackathon | Free / Application and approval | Registration open, 720 registered. HackerSquad runs the conference's build day for 350 people, on the brief of shipping something real in one day rather than a throwaway demo. 3 |
| 4 | Runtime by Modal | Thu, Oct 1, 8:30 AM–6:30 PM | The Midway, San Francisco | AI infrastructure conference | Free / Application | Registration open, 1,068 registered. Three tracks on inference, training and agents, with Scott Wu and Silas Alberti of Cognition, Bryan Catanzaro of NVIDIA, Cat Wu of Anthropic, Bernt Børnich of 1X, Anastasis Germanidis of Runway and Richard Socher all on the programme. 45 |
| 5 | Flower AI Day: Collaborative Superintelligence | Wed, Sep 30, 1:00–8:30 PM | The Pearl, San Francisco | AI summit | Free / Registration open | Registration open, no approval, 477 registered. An afternoon and evening on open agents and models working together, with Nicolas Dessaigne of Y Combinator, Tanya Roosta of AMD, Anthony Annunziata of the AI Alliance and researchers from NASA and the US Department of Energy. 6 |
| 6 | Supabase Select 2026 Hackathon | Sat, Oct 3, 9:00 AM–5:00 PM | 580 20th St, San Francisco | Hackathon | Free / Registration open | Registration open, 443 registered. Everyone who takes part shares 100K+ in credits from Supabase, Claude, Stripe and Vercel; the top six teams demo on stage for a 31K credit pool judged by Supabase's CEO and CTO, Stripe and Anthropic. 7 |
| 7 | Agent Hackathon | Wed, Sep 30, 10:00 AM–6:00 PM | San Francisco; street address not published | Hackathon | Free / Application and approval | Registration open, 23 registered. Solana Foundation and The AI Collective set one brief: build a product, service or API that an agent would buy. $1,500 for first place, with a happy hour after. Space is very limited. 8 |
| 8 | Berkeley SkyDeck Batch 22 Demo Day | Wed, Sep 30, 1:00 PM | Berkeley SkyDeck, 2150 Shattuck Ave, Penthouse, Berkeley | Demo day | Free / Application, investors | Registration open by application. Eighteen companies from UC Berkeley's accelerator pitch on physical AI, GPU hardware accelerators, biotech therapeutics and enterprise agent infrastructure, followed by an expo and after-parties. 9 |
| 9 | Radar IRL: Fighting token fraud | Wed, Sep 30, 4:30–8:30 PM | Stripe, South San Francisco | Invite-only workshop | Free / Curated | Registration open when checked, 39 registered. Stripe's payments-intelligence team opens with remarks from product head Samuel Bakouch, then a fireside with Suno's product leads and Radar's head of engineering, then a build session. Bring a laptop. 10 |
| 10 | Cache Me Outside: A Rooftop Party at the AI Conference | Wed, Sep 30, 5:00–8:00 PM | KAIYŌ Rooftop, 701 3rd Street, San Francisco | Themed tech party | Free / Registration open | Registration open, 244 registered. Baseten and LangChain take the roof five minutes from the conference floor for cocktails, a live band and one short piece of programming: a mini-debate between two conference headliners, settled by the crowd. 11 |
| 11 | STACKED: Sandboxes, Inference, & Observability | Wed, Sep 30, 6:00–8:30 PM | San Francisco; street address not published | Engineering talks | Free / Registration open | Registration open, 270 registered. E2B, Fireworks AI and Braintrust run three lightning talks on what sits under a production agent: sandboxing untrusted code, serving models at agent-loop speed, and telling whether a change helped. 12 |
| 12 | How AI Models Learn to Do Real Work | Wed, Sep 30, 5:30–8:30 PM | San Francisco; street address not published | Fireside | Free / Registration open | Registration open, 255 registered. Osvald Nitski, head of product at Mercor, and Chris Clark, co-founder of OpenRouter, on the gap between benchmark scores and work that holds up, and what reinforcement-learning environments change about it. 13 |
| 13 | Kevin Hartz: What Great Founders See Before Everyone Else | Tue, Sep 29, 3:30–5:30 PM | Founders, Inc., Fort Mason, San Francisco | Fireside | Free / Approval required | Registration open, 192 registered. Kevin Hartz, who co-founded Eventbrite, talks with Marvelous's Merve Isler about the signals he looks for early. No panels and no presentations; the room is curated and approval-based. 14 |
| 14 | Real-Time Video Agents Hack - SF | Fri, Oct 2, 9:00 AM–7:00 PM | San Francisco; street address not published | Hackathon | Free / Application | Registration open, 23 registered; registration closes Sep 29. A day building agents that can search and act on video, with VAST Data, NVIDIA, CoreWeave and Weights & Biases. First prize is an NVIDIA DGX Spark. 15 |
| 15 | Above the Fog: Founders × Investors Rooftop Mixer | Mon, Sep 28, 6:00–9:00 PM | San Francisco; address shared with confirmed guests | Founder mixer | Free / Invite-only | Registration reviewed individually, 146 registered. SF Startup Labs opens its week on a rooftop with pre-seed and seed investors and operators. Drinks are hosted; there is no programme by design. 16 |
| 16 | Supabase Select 2026 | Fri, Oct 2, 9:00 AM–7:00 PM | 555 20th St, San Francisco | Developer conference | Ticketed, US$256 | Sold out when checked on Sep 27, 294 registered; waitlist open. A curated day of talks with Steve Wozniak, Andrew Ng, and Supabase's CEO Paul Copplestone and CTO Ant Wilson. 1718 |
| 17 | ThinkingAI Agentic Growth Summit 2026 | Mon, Sep 28, 12:00–4:00 PM | Computer History Museum, Mountain View | AI summit | Free / Application | Sold out when checked on Sep 27, 903 registered. The AI Collective asks what changes about an operating model when the analytics layer can act rather than report, for the people who own growth, retention and monetization. 19 |
| 18 | Anthropic × Cerebras: Cafe Compute | Thu, Oct 1, 6:00–9:00 PM | San Francisco; street address not published | Developer social | Free / Waitlist | Sold out when checked on Sep 27, 318 registered. An evening for people building on Claude who want faster inference, with the Cerebras team on hand. 20 |
| 19 | Foresight Institute and Convergent Research Salon: Launching Atlas and Oath | Thu, Oct 1, 5:30–8:30 PM | The Fold, San Francisco | Salon | Free / Waitlist | Sold out when checked on Sep 27, 226 registered. Two focused research organizations introduce themselves: Oath, which is building tools to oversee advanced AI with formal methods in Lean, and Atlas Ignota, which maps the gaps AI opens in society's defenses. 21 |
Monday, September 28
A build day at Cloudflare, and a rooftop before the week starts
Startup Speedrun Hackathon runs 9:00 AM to 5:00 PM at Cloudflare HQ, 101 Townsend St. Brainbase Labs runs it with Anthropic, Cloudflare and Stripe on a simple premise: take a startup idea and get as far as you can in eight hours — build the product, deploy the infrastructure, set up payments, give your agents tools. Three tracks are published, and teams are encouraged to combine them: agentic payments, agents that deploy infrastructure, and autonomous organizations coordinating through tools such as Slack and Linear. Winners get free incorporation and compute credits, with more than $27,500 across the prizes. Kickoff is at 9:30 AM and the room has already registered 73 people against approval-based admission. Status: confirmed listing; registration open, application and approval required. Apply for the Startup Speedrun Hackathon. 2
ThinkingAI Agentic Growth Summit 2026 was scheduled for 12:00 to 4:00 PM at the Computer History Museum in Mountain View. The AI Collective frames the afternoon around one question — what changes about the operating model when your analytics layer can act rather than report — with the answers coming from teams that already run it. The audience is deliberately narrow: growth, product, data and engineering leads at consumer apps, marketplaces, games and B2B products. Status: sold out when checked on September 27, with 903 registered. Open the summit page. 19
Above the Fog: Founders × Investors Rooftop Mixer runs 6:00 to 9:00 PM at a rooftop address shared with confirmed guests. SF Startup Labs — a non-equity accelerator — kicks off its week with founders arriving in the city alongside pre-seed and seed investors and operators. The organisers are explicit that there is no panel, no pitch and no networking game, and registrations are reviewed by hand rather than approved automatically. Status: confirmed listing; invite-only, 146 registered. Request entry to the Above the Fog mixer. 16
Tuesday, September 29
The conference opens, and a hack day opens with it
The AI Conference 2026 begins its three days at Pier 48, Shed A and B, in the Mission Rock neighbourhood, running 9:00 AM to 6:00 PM through Thursday. The programme is seven tracks and more than 120 speakers, spanning agentic systems, AI infrastructure, alignment, startups and applied work across industries, with Peter Norvig of Stanford HAI and Ann Miura-Ko of Floodgate among the first confirmed names. Tuesday is also the workshop day, capped at 350 people, with eight 90-minute sessions split between a technical track for engineers and a leadership track. Ticket tiers were still on sale on the official site when checked on September 27. Status: confirmed listing; tickets on sale. Open The AI Conference ticket page. 1
The AI Conference Hack Day 2026 runs 9:30 AM to 7:00 PM in San Francisco, at an address not published on the event page. HackerSquad runs the build day for 350 people, and the framing is pointed: a working product and a real business inside one day, rather than a prototype that dies overnight. Drafting behind it is an Anthropic forecast that the first billion-dollar company with a single employee is close. Registration is free with approval, and 720 people have already registered against the 350 places. Status: confirmed listing; registration open, application and approval required. Apply for The AI Conference Hack Day. 3
Kevin Hartz: What Great Founders See Before Everyone Else runs 3:30 to 5:30 PM at Founders, Inc. in Fort Mason. Hartz co-founded Eventbrite and has spent the decades since backing and building companies, and the conversation with Marvelous's Merve Isler is about the signals he reads early and what he sees as AI changes how companies get built. No panels, no presentations, and an approval-based room that has registered 192 people. Status: confirmed listing; registration open, approval required. Request entry to the Kevin Hartz fireside. 14
Wednesday, September 30
Seven rooms, one evening, and the day the week peaks
Agent Hackathon runs 10:00 AM to 6:00 PM in San Francisco, at an address not published on the event page. Solana Foundation and The AI Collective set one brief — build a product, service or API that an agent would buy — and hand the results to a panel after a live build period. First prize is $1,500, second $500 and third $250, with food, coffee and a happy hour after. The page says space is very limited and asks people to apply rather than RSVP. Status: confirmed listing; registration open, 23 registered, application required. Apply for the Agent Hackathon. 8
Berkeley SkyDeck Batch 22 Demo Day pitches from 1:00 PM at Berkeley SkyDeck, 2150 Shattuck Ave. Eighteen companies graduate from the UC Berkeley accelerator across physical AI, GPU hardware accelerators, biotech therapeutics and enterprise agent infrastructure. The pitches run into a Demo Day Expo where the founders are on the floor, then into after-parties. Attendance is by application and the accelerator describes the room as investors. Status: confirmed listing; registration open by application. Apply for the SkyDeck Demo Day. 9
Flower AI Day: Collaborative Superintelligence runs 1:00 to 8:30 PM at The Pearl. Flower Labs builds the day around open agents and models improving together, and the speaker list is unusually broad for a free single-track event: Nicolas Dessaigne, general partner at Y Combinator; Tanya Roosta of AMD; Anthony Annunziata, founder of the AI Alliance at IBM; James Casaletto of NASA; Jerry Watkins of the US Department of Energy; and Nic Lane, Flower's chief scientist. Registration is open without approval and 477 people have registered. Status: confirmed listing; registration open. Register for Flower AI Day. 6
Radar IRL: Fighting token fraud runs 4:30 to 8:30 PM at Stripe in South San Francisco. The event page describes an invite-only, hands-on afternoon, and registration was open when checked. Samuel Bakouch, Stripe's head of product for payments intelligence, opens, then a fireside with Suno's product leads Madden Titus and Nick Cariello and Jacob Meltzer, who leads engineering for Radar at Stripe. From 6:15 the room works one-to-one with the Radar team on its own setup, and a happy hour closes it out. Bring a laptop. Status: confirmed listing; curated, 39 registered. Register for Radar IRL. 10
Cache Me Outside: A Rooftop Party at the AI Conference runs 5:00 to 8:00 PM at KAIYŌ Rooftop, 701 3rd Street, a five-minute walk from the conference floor. Baseten and LangChain host cocktails, a live band, an oyster bar and a chocolate truffle bar, and keep exactly one piece of programming: a short live debate between two of the conference's headliners, with the crowd deciding. Status: confirmed listing; registration open, 244 registered, space limited. RSVP for Cache Me Outside. 11
How AI Models Learn to Do Real Work runs 5:30 to 8:30 PM in San Francisco, at an address not published on the event page. OpenRouter hosts a fireside with Osvald Nitski, head of product at Mercor, and Chris Clark, OpenRouter's co-founder, on the distance between a good benchmark score and reliable work. The conversation covers how training, evaluation and deployment are changing — expert data, reinforcement-learning environments, model choice — and what shifts when models can take on work that used to need a person. Status: confirmed listing; registration open, 255 registered. Register for the OpenRouter fireside. 13
STACKED: Sandboxes, Inference, & Observability runs 6:00 to 8:30 PM in San Francisco, at an address not published on the event page. E2B, Fireworks AI and Braintrust split the evening into three lightning talks on what production agents sit on: isolating untrusted code that an agent writes and runs, serving models fast enough to keep up with an agent loop, and knowing whether a change actually made the system better rather than busier. Doors open at 6:00 with food and a bar cart, talks run 6:45 to 7:30, and the rest is open. Status: confirmed listing; registration open, 270 registered. Register for STACKED. 12
Thursday, October 1
A three-track infrastructure day, then two closed doors
Runtime by Modal runs 8:30 AM to 6:30 PM at The Midway. Modal's conference is built for engineers running AI in production, and the speaker list is the strongest technical roster of the week: Erik Bernhardsson and Akshat Bubna of Modal, Scott Wu and Silas Alberti of Cognition, Bryan Catanzaro of NVIDIA, Cat Wu, who leads product for Claude Code at Anthropic, Bernt Børnich of 1X, Anastasis Germanidis of Runway, Richard Socher of Recursive, Harrison Chase of LangChain, Sara Hooker of Adaption, Quan Vuong of Physical Intelligence, swyx of Latent Space and Dax Raad of opencode. Three tracks run across inference, training and agents. Registration is free with a short application, and 1,068 people have registered. Status: confirmed listing; registration open, application required. Apply for Runtime by Modal. 45
Anthropic × Cerebras: Cafe Compute was scheduled for 6:00 to 9:00 PM in San Francisco, at an address not published on the event page. Cerebras and Anthropic run a casual evening for people building on Claude who want faster inference, pitched as cocktails and conversation rather than talks. Status: sold out when checked on September 27, with 318 registered; the page is taking a waitlist. Join the Cafe Compute waitlist. 20
Foresight Institute and Convergent Research Salon: Launching Atlas and Oath was scheduled for 5:30 to 8:30 PM at The Fold. Two focused research organizations introduce themselves. Oath is building tools to oversee and control advanced AI using formal methods, starting with the Lean proof assistant and aiming at oversight that scales to systems too fast to watch directly. Atlas Ignota maps the gaps AI creates in society's defenses — epistemic security, cybersecurity, model-weight security, critical infrastructure — and turns the workable ideas into organizations. Doors open 5:30 with food and drinks, the fireside starts at 6:30, and the evening ends at 8:30. Status: sold out when checked on September 27, with 226 registered; +1s are welcome if they register. Join the Foresight salon waitlist. 21
Friday, October 2
A sold-out curated day, and one hackathon with a deadline
Supabase Select 2026 runs 9:00 AM to 7:00 PM at 555 20th St. This is the week's most selective ticket: US$256, in-person and application only, and the room is capped. The speaker list is the draw — Steve Wozniak, Andrew Ng, and Supabase's own Paul Copplestone, Ant Wilson and Deepthi Sigireddi — and the day is pitched as first-hand information about what is coming in Supabase rather than a general conference. Status: sold out when checked on September 27, with 294 registered; the waitlist runs through Luma. Join the Supabase Select waitlist. 1718
Real-Time Video Agents Hack - SF runs 9:00 AM to 7:00 PM in San Francisco, at an address not published on the event page. tokens& runs the San Francisco leg of a three-city series with VAST Data, in collaboration with NVIDIA, CoreWeave, Weights & Biases and SpaceXAI. The brief is agents that make video searchable and useful, since most of it otherwise sits in storage unwatched. Prizes include an NVIDIA DGX Spark and Cursor credits. Registration closes September 29, so this is the one entry in the issue with a deadline before the week even starts. Status: confirmed listing; registration open, 23 registered, application required. Apply for the Real-Time Video Agents Hack. 15
Saturday, October 3
Supabase Select 2026 Hackathon runs 9:00 AM to 5:00 PM at 580 20th St, giving the sold-out Friday conference a second, open route into the same crowd. Everyone who takes part shares more than 100K in credits from Supabase, Claude, Stripe and Vercel; the top six teams demo on stage for a 31K credit pool. The judging panel is Ant Wilson and Paul Copplestone of Supabase, Pratik Gupta of Stripe and John Robison of Anthropic. Registering for both the Select conference and this hackathon gets automatic approval, and 443 people are already registered. Status: confirmed listing; registration open, free. Register for the Supabase Select Hackathon. 7
Nothing in this issue falls on Sunday, October 4. The next edition, published that morning, picks up San Francisco Tech Week, which runs October 5 to 11. 22
How to choose
- If you want to ship something. Five builds, and the two with real prize pools need applications today: Startup Speedrun on Monday at Cloudflare, The AI Conference Hack Day on Tuesday, the Agent Hackathon on Wednesday, and both Supabase Select events — the hackathon on Saturday is the one that is free and open.
- If you want the year's infrastructure argument in one room. Runtime by Modal on Thursday is the densest technical programme of the week and free to apply to. The AI Conference itself runs all three days from Tuesday and is the only listing here with a paid ticket and a workshop day.
- If you want founders and capital in a small room. Kevin Hartz at Founders, Inc. on Tuesday and the Above the Fog mixer on Monday both run on review rather than RSVP. SkyDeck's demo day on Wednesday puts eighteen graduating companies in front of investors in Berkeley.
- If you want a technical evening with no build attached. Wednesday alone carries three: the OpenRouter fireside at 5:30, the E2B, Fireworks and Braintrust talks at 6:00, and the Stripe Radar afternoon in South San Francisco at 4:30.
- If you want the room rather than the agenda. Cache Me Outside on the KAIYŌ roof on Wednesday is the week's social anchor, and the Above the Fog rooftop on Monday trades a programme for a table you can talk at.
- If you are planning around a trip. Four entries sit outside San Francisco: the Agentic Growth Summit at the Computer History Museum in Mountain View on Monday, SkyDeck in Berkeley on Wednesday, and the Stripe Radar session in South San Francisco. Everything else is within the city.
Source boundaries and disclosures
This is a curated shortlist of 19 verified Bay Area tech, AI and founder events for September 28 to October 4, 2026. Every date, time and venue was taken from the event's own page, and registration status is what those pages reported on September 27, 2026. Where a street address is not listed in an entry, the host has not published one on the event page; those addresses are usually released to registered or approved guests.
Every entry carries a direct registration link, and the ranking weights topic relevance first and then host credibility, whether a programme or speaker list is published, how selective the room is, and whether registration is still open — which is why the four rooms that had already closed when checked sit at the bottom.
The AI Conference's official site was the source for its dates, venue, track count, speaker line-up and workshop cap. Luma's San Francisco discovery listing and the Foundercal SF calendar supplied candidate recall, and every shortlisted event was then opened on its own page for its times, host and registration state. Cerebral Valley's events directory surfaced two in-window San Francisco events this week, Flower AI Day and Supabase Select, and both are listed. Eventbrite's San Francisco tech listings inside this window were recurring networking nights, comedy shows and out-of-window dates; none cleared the bar for a technical event with a published programme. Partiful's San Francisco explore page carried social and community events only, with no in-window tech event.
For events that appear on an aggregator calendar as well as their own page, the own page decided. San Francisco Tech Week runs October 5 to 11, 2026, which falls in the next issue's window rather than this one.
References
- 1The AI Conference 2026
aiconference.com
- 2Startup Speedrun Hackathon
luma.com
- 3The AI Conference Hack Day 2026
luma.com
- 4Runtime by Modal
luma.com
- 5Runtime — a conference by Modal
modal.com
- 6
- 7Supabase Select 2026 Hackathon
luma.com
- 8Agent Hackathon
luma.com
- 9Berkeley SkyDeck Demo Day
skydeck.berkeley.edu
- 10Radar IRL: Fighting token fraud
luma.com
- 11
- 12
- 13
- 14
- 15Real-Time Video Agents Hack - SF
luma.com
- 16
- 17Supabase Select 2026
luma.com
- 18Supabase Select 26
select.supabase.com
- 19
- 20
- 21
- 22San Francisco Tech Week calendar
luma.com
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