Alliance Francaise de San Francisco

Attended their coffee & croissant hour with about ten other folks.  People seemed at B1 or higher level, I was the weakest speaker.  A native speaker or two attended as well.  In the short hour, we played two simple games, including a round of "20 questions".
Everybody had fun, and I learned a word or two in passing, and gained a little confidence.
Highly recommended, worth the $20.