On Friday, Sept. 22, students can get free tickets to see the 8 p.m. showing of Mahalia:The Gospel, a Black Repertory company performance at Edison Theatre. Beginning at 6 p.m., students with a WUSTL ID can pick up a free ticket at the Edison Theatre Box Office and discover why Mahalia Jackson was called the best gospel singer who ever lived. For more information, call 935-5022. Black Repertory Theatre