"Underground" doesn't just mean night, doesn't just mean music, doesn't just mean hip/trendy byword. If you want a jolt of that old-fashioned DIY charge that parties used have in San Francisco, I highly recommend a stop by Zinefest this weekend in the County Fair building in Golden Gate Park. You'll feel punky, nerdy, hip, creative, and cute all at once. The only thing missing is "loud" -- but you'll be shouting in your head how neat everything is.
Oh, and if the Twirl and Dip ice cream truck is nearby, you can dance for joy with a giant sprinkle-topped sundae. Who needs clubs at all? Well anyway, here's some parties.