Every Wednesday night I host an open gaming night at Yetizen Innovation Lab in downtown San Francisco. I run weekly games of Pathfinder Society (Paizo's organized play for Pathfinder) and would love to see more regular players (and judges). We play from around 6pm until a bit after 10 (though we can stay later if we want to finish the scenario). The space is located near 1st St and Howard so just a few blocks from the Montgomery BART/Muni stop. Parking in the area is tricky (though not impossible if you look for it on nearby side streets) and there are plenty of nearby dinner options.
The game night is an open game night - so if you want to run a regular campaign or get a group of players together for an boardgame or card game that is also welcome.
Sign up for the specific game(s) you want to play at http://warhorn.net/sf-geek-games-night/ (not just here on Meetup).