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Graffiti may have gone mainstream long ago, but graffiti historian Roger Gastman still prefers the term “vandalism” to the nice society euphemism “street art.” Gastman’s own career parallels that of the culture he curates in books, movies, and museum exhibits: The Bethesda native started writing on walls at a time of overlap between the graffiti scene and the hardcore and go-go music scenes, then began documenting those intersections with the much loved, Vice-before-Vice local zine While You Were Sleeping. He eventually moved to L.A. to work with big-name artists like Shepard Fairey (he also co-produced the coming-out show by prankster/scam artist Mr. Brainwash, as documented in Banksy’s film Exit Through the Gift Shop). But Gastman has always stayed connected to home, publishing Free Agents, a D.C. graffiti history book; curating the Corcoran’s 2013 punk/go-go exhibition “Pump Me Up”; and working with local filmmaker Joseph Pattisall on his documentary The Legend of Cool “Disco” Dan. Gastman and Pattisall collaborate again (along with narrator John Waters) on Wall Writers, a new film which looks back to the origins of graffiti in the late ’60s and early ’70s, well before anyone called it art or dreamed of making a living off of it. The film shows at 7:30 p.m. at the AFI Silver Theatre and Cultural Center, 8633 Colesville Road, Silver Spring. $13. (301) 495-6700. afi.com/silver.