PJ Harvey’s first concert in support of “Uh Huh Her” and docs about Gram Parsons and the Runaways highlight the three-day Don’t Knock the Rock Film and Music Festival, to be held Aug. 12-15.Opening Night Gala Aug. 12 will feature the West Coast premiere of “Gram Parsons: Fallen Angel,” directed by Gandulf Hennig. “Edgeplay: A Film About the Runaways,” directed by Runaways bassist Vicki Tischler-Blue, heads up closing night on Aug. 15. All screenings are at the ArcLight in Hollywood. Harvey, who had been booked for the now cancelled Lollapalooza tour, will perform at the Henry Fonda Music Box on Aug. 15. Also performing at shows at Club Lingerie, the El Rey and Fonda will be John Doe, dios, Dead Moon, Built to Spill, Starlite Desperation, Black Heart Procession and Jon Brion.