Perfect prelude to viewing this film: the Sacramento County Historical Society is sponsoring a free tour of the Sacramento Rock 'n Radio Museum at 7 p.m. It's at the site of the old Oasis ballroom, 907 20th St., between I and J. The museum is open on 2nd Saturdays, but this is a chance to get a special tour with and reminiscences from longtime media producer and onetime KZAP disc jockey Dennis Newhall and KXJZ “Blues Party” radio show host Mick Martin. Begun 10 years ago as a display of Newhall’s collection of rock music memorabilia from the 1950s to the present , the collection has grown to over 2500 pieces.