Members of the Lake Street Church youth choir rehearse Broadway Night: All in This Together, a revue they will take part in at 7 p.m. on Saturday. “We have to keep singing,” said Diana Schmück, music director at the church. “We have to keep making music of all kinds. It takes us away from dwelling on the negatives and it gives us hope.” Dozens of church members, adults and kids, plus a few ringers will perform songs from Hamilton, Camelot, West Side Story, Ragtime, High School Musical and other Broadway shows. It’s a fundraiser that supports the church, at 1450 Chicago Ave., and Interfaith Action of Evanston.