The challenge for Arne Johnson and Shane King, the two-guy director/cinematographer/editor crew, was to busy themselves at the Rock ’n’ Roll Camp for Girls in Portland, Oregon, and come away with a coherent video narrative after only five days of scheduled camp activity. The effort was valiant, but the documentary is often a jumble of haphazardly shot footage, with too many interview bites, and sketchy sequences. Still, the subject matter is irresistible: a females-only music haven where girls age eight to 18, many fraught with personal problems, can express their anger and shed their insecurity and shame. Their cure is to learn the rudiments of explosive riot grrrl music from a sympathetic counselor staff of screeching-and-screaming gal rockers like Sleater-Kinney’s Carrie Brownstein. 90 minutes | Museum Of Fine Arts: July 31; August 2, 7, 9, 10, 16