I have been looking for good meetup groups in the Bay Area for a few months and finally got inspired by you to solve my own problem.

I have created a Hacker News Meetup for Bay Area: https://www.meetup.com/meetup-group-zxkdpjmb/

It looks like enough people are interested in different parts of the Bay Area that we can alternate meetups in SF and in South Bay/Peninsula.

If anyone will like to help out or can donate space to meetup, please email me - my profile here has my contact details.