Experimental filmmaker Martin Barney returns with River of Fundament, a five-hour opera that the Cleveland Institute of Art Cinematheque plans to show in its entirety. Tonight at 6, it shows the film with two 20-minute intermissions. And tomorrow at 1:30 p.m., it shows it with one 20-minute intermission and an hour break for dinner. Inspired by Norman Mailer's 1983 novel Ancient Evenings, the movie centers on the New York elite who mingle at Mailer's wake at his Brooklyn brownstone. Tonight's showing marks its Cleveland premiere. Tickets are $30. (Niesel)