MUSIC: San Francisco Mixtape Society presents their third event, which is themed Foreign vs. Familiar. Assemble a mix according to the theme in any format (cassette, CD, or USB) and trade with someone at the show. If you think your mix is worthy, enter to the contest, which has various categories and prize packages. Note: the event start time is 4 p.m.

4 to 6 p.m. // Make-Out Room (3225 22nd St) // free

EROTIC: It's another installment of Naked Girls Reading, in which burlesque dancers Carol Queen, Dottie Lux, Lady Monster, Isis Starr, and Kimberlee Cline offer advice, How-To's, and special tips.

7 to 9 p.m. // Center for Sex & Culture (1519 Mission St) // $15-20

BENEFIT: SurfPulse.com's Second Sunday Surf Party will benefit ArtSeed’s Apprenticeships Program, which brings long term artist mentors into the lives of children. Enter to win a custom Las Olas Surfboard, and watch some surf flicks.

6 to 10 p.m. // Joxer Daily's (46 West Portal Ave) // free