1) Exhibit Hall A Cow palace. $900 per night if you work it right. but it is huge: 20,000 square feet
cowpalace.com/rentals.html

2) 1015 Folsom, upstairs. has the right atmosphere, has booths on the side, same for 715 folsom, they have an side room upstairs.

3) Blue Cube, I hate the location but they do not seem to be doing too well.

4) cell space Cellspace, 2050 Bryant St., San Francisco you would have to get an alcoholo license, but it is super cheap
cellspace.org/

5) broadway studio 435 Broadway, would be a very very cool place. great dance floor, great atmosphere, has bar and grill, lots of nooks and crannies for private conversations. broadwaystudios.com/