Here are five SF ecosystems that play a role similar to Cerebral Valley—active communities that run product-focused events, recruiting, and partner with major players: 1. South Park Commons (SoMa / South Park) A tight-knit builder community + “Founder Fellowship” that invests at the -1→0 stage and hosts frequent AI-centric demos/hackathons. Apply or track their public events.    2. Founders, Inc. (Fort Mason campus) A 42,000-sq-ft founder campus that runs recurring AI hackathons and demo days, and writes first checks. Follow their Luma calendar and program pages.   3. HF0 (Hacker Fellowship Zero) — Residency (Alamo Square / SF) Highly selective live-in residency for repeat founders; offers meaningful upfront funding and deep mentor access; widely covered for its intense builder culture.    4. AGI House (SF & Hillsborough) AI-focused hacker houses and community with referral-based SF outpost; supported/visited by notable industry figures and cloud partners; frequent AI events.   5. SHACK15 (Ferry Building) Members’ club + venture arm that’s become a go-to venue for AI meetups and hackathons (including Cerebral Valley’s). Join as a member or attend hosted events.  
If you want, I can set up a weekly Monday 9am digest of upcoming AI events from these five so you never miss another one.