BuildFest: Demos & Challenges
Crewbase Collective Mixers · San Francisco
3-hour build with judging, demos, team formation.
Open
The Bay Area hackathon calendar
Everything worth building at,
gathered in one place.
Every hackathon across San Francisco and the wider Bay Area, kept current morning and evening. Subscribe once and the next one finds you — no more combing through invite links and half-dead group chats.
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/calendar.icsWhat’s coming up
September 2026
- Open
Llama Lounge 26: The AI Startup Event Series @ Microsoft
Llama Lounge: The AI Startup Series · Microsoft, Mountain View
4-hour build with demos, team formation.
WaitlistPunk Software Hack Night: Data liberation ✊
Imbue Events · Civic Center, San Francisco
4-hour build with demos, team formation.
OpenData & AI Hackathon: Real job. Real AI. Real scale.
Devnovate · AWS Builder Loft, San Francisco
10-hour build.
OpenBeta x Alibaba Cloud x AMD AI Agent Hackathon Demo Day
Beta University Events · Palo Alto
5-hour build with judging, demos, team formation.
ApprovalBuilding for SF — A Free Civic Buildathon, Sept 11-12 - Two days. Real projects. A city that works better.
Abundant Leaders San Francisco · Financial District, San Francisco
23-hour build.
OpenThe CAD Challenge 2026
The CAD Challenge · University of California, Berkeley
3-day build with a submission deadline; $750 prizes.
Check page$750 prizesCoreWeave Hacks: Agent Loops Hackathon with Weights & Biases, AGI House, and TypeSafe AI
Weights & Biases · 400 Alabama St ste 202, San Francisco
2-day build with judging, demos, team formation, a submission deadline; $20k+ prizes.
Open$20k+ prizes🔥 AI Hackathon with $4500 cash prizes - Qoder & Neo4j
B.E.L.L.E Community · Rincon Hill, San Francisco
12-hour build; $4500 cash.
Open$4500 cashAI + Education Hackathon@Stanford
Beta University Events · Stanford
8-hour build with demos, team formation, a submission deadline; prizes listed.
OpenPrizes listedOpen Model Hack - Gradient x Google Deepmind
tokens& · San Francisco
10-hour build with demos, team formation.
WaitlistAI Infra Signal: Build, Operate, and Monetize Intelligence
OpenStages Calendar · Sunnyvale
5-hour build with demos, team formation.
OpenAI Filmmaking Masterclass + Hackathon
The Multimodal Society · Financial District, San Francisco
10-hour build.
OpenAI Security Hackathon - By Hackathons.team
Wasmer · 501 Folsom St, San Francisco
10-hour build with team formation.
OpenAI Infra Summit Hackathon
lablab.ai Events · Santa Clara Convention Center, Santa Clara
3-day build with judging, demos, team formation; prizes listed.
OpenPrizes listedMantisGrid AI Hackathon & Summit 2026
MantisGrid AI · Mitchell Park Community Center, Palo Alto
10-hour build with judging, demos, team formation, a submission deadline; $10,000 cash.
Open$10,000 cash- Approval
Night Hack by Founders, Inc.
Founders, Inc. Events · San Francisco
7-hour build with judging, demos, team formation; prizes listed.
ApprovalPrizes listedDream AI Hackathon 2026
LIKELION US · Frontier Tower 🧑🚀, San Francisco
12-hour build with judging, team formation, a submission deadline; $50 prizes.
Open$50 prizesTrueFoundry Agent Harness Hackathon
[SF] HackerSquad · 3120 Scott Blvd, Santa Clara
11-hour build with judging, demos, team formation, a submission deadline.
OpenSVYCA Youth for Earth (Y4E) Hackathon
Silicon Valley Youth Climate Action · Stanford University, Stanford
29-day build with a submission deadline; $2,700 prizes.
Check page$2,700 prizesThe Next Interface Hackathon: Rethink how we talk to AI
Leverage · San Francisco
8-hour build with demos.
Check pageAlpaca x Conviction Trading Hackathon
Frontier Tower SF · Frontier Tower @ Spaceship 995 Market Street, San Francisco
4-hour build with demos, team formation; $2,000 prizes.
Approval$2,000 prizesSF Enterprise Hackathon 2.0
Devnovate · San Francisco
8-hour build with judging, demos, team formation; prizes listed.
ApprovalPrizes listedA Night with AI Builders, Startup Stories & Community -- Celebrating One Year of the SVAI Hub
Silicon Valley AI Hub · 135 Constitution Dr, Menlo Park
3-hour build with demos, team formation.
OpenLong Horizon Agents Hackathon
tokens& · San Francisco
10-hour build with judging, demos, team formation, a submission deadline.
ApprovalLong Horizon Agents Hackathon
tokens& · San Francisco
10-hour build with judging, demos, team formation, a submission deadline.
OpenThe Agent Arena Hackathon | Cerebral Valley
Cerebral Valley · San Francisco
2-day build with team formation; $10,000 cash.
Open$10,000 cashBuild Your AI Co-Founder Hackathon
Crewbase Collective · San Francisco
12-hour build with demos, team formation.
Open- Open
Shower Hacks
Shower Hacks · location on event page
12-hour build with a submission deadline; $9,750 prizes.
Check page$9,750 prizes- Check page
Bitrig Hacks: iPhone 18 Edition
Y Combinator · San Francisco
8-hour build with judging, demos, team formation; prizes listed.
OpenPrizes listedITCHATHON - Solve actual problems
ITCH · European Startup Embassy, San Francisco
9-hour build with team formation.
Open- OpenPrizes listed
The AI Conference Hack Day 2026
[SF] HackerSquad · Mission Bay, San Francisco
10-hour build with demos, team formation; prizes listed.
OpenPrizes listedCollaborative Agent Hackathon @ Stanford
Flower Labs · 389 Jane Stanford Way, Stanford
10-hour build with demos, team formation; prizes listed.
OpenPrizes listedPicnic with Builders at Stanford
SF Startup Labs · Stanford University, Stanford
2-hour build with team formation.
OpenOctober 2026
Oakland Tech Week: The Future of Oakland
Hack the Hood Community · Oakland
2-hour build with demos, team formation.
ApprovalReal-Time Video Agents Hack - SF
tokens& · San Francisco
10-hour build with demos, team formation; prizes listed.
OpenPrizes listedPersonalized Medicine Builders: Demos, Discussion and Social
Research to the People Patient Hackathons · 81 Langton St, San Francisco
3-hour build with demos.
OpenThe AI Commerce Gallery - Hackathon
AI Valley · San Francisco
12-hour build with judging, demos, team formation, a submission deadline; prizes listed.
OpenPrizes listedOctober 3 Hackathon
Frontier Tower SF · Frontier Tower @ Spaceship 995 Market Street, San Francisco
13-hour build.
OpenDublin Hacx
Emerald High School · SAP Office — San Ramon, CA, San Ramon
12-hour build with a submission deadline; $2,250 prizes.
Check page$2,250 prizesAI Agents That Own Their Inference - Hackathon
[SF] HackerSquad · San Francisco
10-hour build with judging, demos.
ApprovalAI Hackathon: Sales Copilot AI
TatianaSF · Northern Waterfront, San Francisco
8-hour build with judging, demos, team formation; prizes listed.
OpenPrizes listed- Approval
Cyberdefense Hackathon
tokens& · San Francisco
10-hour build with judging, demos, team formation, a submission deadline; prizes listed.
ApprovalPrizes listedAI Native Summit - SF TechWeek 2026
PAI Palooza Presents - Build with AI Native Studio - 2026 · 847 Howard St, San Francisco
2-day build with demos, team formation; $50,000 cash.
Open$50,000 cashTech Week Hackathon
Frontier Tower SF · Frontier Tower @ Spaceship 995 Market Street, San Francisco
10-hour build.
OpenCompany Brain Hackathon: Build an AI Agent That Knows Your Organization
TechEquity Ai - Silicon Valley · 135 Constitution Dr, Menlo Park
4-hour build with judging, demos.
Open- OpenPrizes listed
Fincantieri Maritime Dual-Use Hackathon
Mind the Bridge · Mind the Bridge, San Francisco
2-day build with judging, team formation; prizes listed.
OpenPrizes listedUniversal Celebration Hackathon
BondHaus · AWS Builder Loft, San Francisco
11-hour build with demos, team formation.
OpenStartup Sprint: Prove you're fundable
Proving Ground · Palo Alto
3-day build with judging, demos, team formation, a submission deadline.
ApprovalMulti-Model Hackathon @AWS Builders Loft
Beta University Events · San Francisco
9-hour build with judging, demos, team formation; prizes listed.
ApprovalPrizes listedDell x NVIDIA Hackathon
Frontier Tower SF · Frontier Tower @ Spaceship 995 Market Street, San Francisco
10-hour build.
OpenNovember 2026
HackStorm 3.0: Sense, Think and Act
HackStorm · San Francisco, California, USA, San Francisco
2-day build with a submission deadline; $5,200 prizes.
Check page$5,200 prizesAI Tutor Hackathon
Beta University Events · Stanford
8-hour build with demos, team formation, a submission deadline; prizes listed.
ApprovalPrizes listed- Open
Festiverse 2026: Diwali Hackathon
Events · Financial District, San Francisco
11-hour build with judging, demos, team formation, a submission deadline; prizes listed.
OpenPrizes listedHackwithBay 4.0
Devnovate · AWS Builder Loft, San Francisco
9-hour build with demos, team formation, a submission deadline; prizes listed.
ApprovalPrizes listedDecember 2026
Mango Hacks
krishay suresh · Zoho Corporation, Pleasanton
13-hour build with judging, a submission deadline.
ApprovalAgentic AI Hackathon 2.0 - SF
Devnovate · AWS Builder Loft, San Francisco
9-hour build with demos, team formation; prizes listed.
ApprovalPrizes listedJanuary 2027
⚕️ SF HealthTech Week 2027 Passport! ⚕️(@ JPM)
⚕️SF HealthTech Week⚕️ Events · San Francisco
7-day build with demos.
Open⚕️ HealthTech Week ⚕️ Startup Pitch Competition (@JPM) in Partnership MedStartr
⚕️SF HealthTech Week⚕️ Events · The Foundry SF, San Francisco
3-hour build with judging, demos.
OpenDeveloperWeek 2027 Hackathon
DevNetwork · Santa Clara Convention Center + Online, Santa Clara
17-day build with a submission deadline.
Check pageFebruary 2027
Check page