It’s true that San Franciscans will never pass up the opportunity to don a costume. Halloween, Bay To Breakers, Critical Mass, SantaCon. If there’s a hint of holiday, you can count on someone to go topless or outfit themselves in a Gumby costume. Such is the case for lovEvolution, the annual electronic music post-Burning Man that closes down most of the city’s Civic Center and purports the showing of as much flesh as possible. DJs and turntable companies from around the state set up shop in front of the Asian Art Museum, the public library, and City Hall to deliver new remixes and dance anthems as far as the eye can see.