Learn the inside story of what goes on behind-the-scenes in Hollywood at tonight’s lecture and screening at the Gene Siskel Film Center. Film professor and author Virginia Wright Wexman explores “the star system” in the 6p.m. screening of the 1937 making of A STAR IS BORN with Janet Gaynor, Fredric March and Adolphe Menjou. This version, the first of three that were made (1937, 1954 and 1976) features more comedy than the other two, as it recounts the ill-fated romance between the young ambitious Gaynor and the much older fading star March. 6p.m. 164 N. State Street. (312) 846 2600. Parking at InterPark Self-Park, 20 E. Randolph, $14 for nine hours.