--Buy Mom an orchid at the OrchidMania sale today. Ft. Mason, 10 a.m.-4 p.m., admission is free. Money goes to benefit HIV education.
--Open studios for Mission-based artists! 11 a.m. to 6 p.m. at a number of studios between Mission, 17th Street, and Potrero (check here for studio listings.)
--Free band concert at Golden Gate Park, 1 p.m. in the concourse right outside the DeYoung Museum.
--Fresh oysters at the Academy of Sciences! 1-3 p.m., 875 Howard Street (x 5th), $10 admission.