This month and next month, the Cleveland Museum of Art pays tribute to the late, great writer-director Sidney Lumet by showing many of his films. At 6:45 p.m. today and Friday, it shows 1973's Serpico, a film about a New York City cop (Al Pacino) who turns whistleblower. Tickets cost $11, $9 for CMA members seniors and students. (Niesel)