Spring has sprung! The sun is shining, birds are chirping, and flowers in the park are blooming . . . and immediately being trampled in violent scuffles of police versus protesters. Yes, the not-a-fan-of-the-cold 99 Percent are officially out of hibernation, so it’s fitting that Rooftop Films, another warm-weather staple, is dedicating the opening night of this year’s series to activists and radicals. Its program “This Is What We Mean by Short Films” includes everything from avant-garde animation to footage of OWS’s “Bat Signal” demonstration on the Verizon building. See an old-school revolutionary take on the modern world in Dana O’Keefe’s Aaron Burr, Part 2, or get to know another iconic American in A Brief History of John Baldessari, Henry Joost’s mini doc narrated by Tom Waits. Free speech and good films? Let the revolution begin.

Fri., May 11, 8 p.m., 2012