--Jennifer Granick and Annalee Newitz are co-hosting a Nerd Salon at 111 Minna (x Mission/2nd). There'll be a demonstration of GNU Radio and a challenging puzzle to solve. 6-9 p.m, and it doesn't look like there's a cover (but we could be wrong).
--And Sparkletack Richard fans take note! There's a local history talk at Fort Mason today about how citizens saved the Golden Gate National Recreation Area. $5 donation, Ft. Mason Building A (Buchanan and Marina Blvd.), 7 p.m.