Where would one go in the Bay Area to meet other people that are interested in working on new projects or ventures? Do in-person forums for talking about interesting topics (and potentially working on them) exist in the city? Note that I explicitly didn't say tech startups — I have pretty diverse interests, and I'd be very open to non-tech work, though tech startups are often interesting.
Apologies for this post being Bay Area-centric (though folks might have advice that generalizes).
https://online.stanford.edu/courses/ee380-colloquium-compute...
I'm sure there's a Berkeley equivalent. So maybe my answer is "check out the local university to see if there are open-to-the-public talks or events."
I've found a number of interesting groups on meetup.com, though I find their interface maddening.
I suspect there's a lot of hit-or-miss groups, covering a wide range of topics. So... universities and meetup.com.