ART/BENEFIT: Buy some cutting edge art at a live and silent auction of work from over 150 established and emerging artists at The Silver Era, Southern Exposure's annual fundraiser and art auction, which draws inspiration from the history-making parties thrown at Andy Warhol's Factory throughout the sixties and early seventies. (7:30 p.m., Southern Exposure, 3030 20th Street)

MUSIC: Head to the Knockout for an afternoon/early-evening show featuring Shellshag, a former SF-based stripped-down veteran punk two-piece who are now based in Brooklyn, along with Street Eater, Neon Piss, and Apogee Sound Club. (3 to 7 p.m., The Knock Out, 3223 Mission Street)

PARTY: Be whatever you want tonight at Poser Party, a costume party in which you embody your costume: "Have fun clowning around with historical figures, cartoon characters, famous actors, fairytale characters, and more!" Also featuring vendors, magicians, and fortune tellers, and prizes. (7 to 10 p.m., 50 Mason Social House, 50 Mason Street)