There have been NUMEROUS FlyerTalk get-togethers (mostly meals) in SF and other places in the Bay Area in the past. A few of them were even organized by me. That doesn't mean I'm volunteering to organize another one, however.
Remember that FlyerTalk has existed since 1998 (that's 16 years, folks!). And there are millions of posts, and over half a million registered FT users, including many in the Bay Area. No need to reinvent the wheel and try to find out if there are other people here, and if they would attend an event.
The best (quickest) way to organize one is, "just do it." Propose a date/time and place (usually an eating and/or drinking venue). Start a NEW thread to do this, with the key info clearly stated in the title (sometimes people forget to include salient info in the thread title).
Threads like this that go on and on and on saying, "yeah, I'd attend," but don't talk about specific dates/times/venues, are pretty much a waste of time. If you want to organize something, JUST DO IT!!!