Saturday, October 31, 2026
10:00 AM – 6:00 PM PDT
Stranger Builds: Halloween Hackathon
About this event
The San Francisco leg of a Halloween-themed AI hackathon: one in-person build day on Oct 31 followed by a week of remote work to launch a project with real users, with about $10,000 in cash and credits.
Stranger Builds runs in San Francisco, Melbourne and online. The San Francisco day is an in-person build day in Mid-Market, followed by a week of remote work to finish and launch a project and get real users. Prizes total about $10,000 in cash and credits; challenges and judges had not been announced on the page. Main sponsors are Base44 and Fetch.ai, with partners including Cerebral Valley, The AI Collective and AI Valley.
The Luma page lists 10:00 AM to 6:00 PM on Oct 31. Registration is free with host approval; the exact address is shown to registered guests.
Organized by
Community event organizer behind the Stranger Builds Halloween hackathon, with editions in San Francisco, Melbourne and online.