Monarch has been voted one of San Francisco's top lounges and has a fantastic sound system. It is located 3 blocks from both the Civic Center and Powell St BART stops. Monarch doesn't serve food, but there are plenty of good, inexpensive places to eat in the area.
This is a 21+ venue, so please bring ID. There will be drink specials with Couchsurfing name tag. Name tags will be provided at the event.