Here's what's going on today (Sunday, Dec. 16): Jeff Rousset, an organizer with The Prometheus Radio Project, will speak at Trinity United Methodist Church from 6 to 8 p.m. about how best to start up a community radio station. The Performing Arts Collective of Savannah's annual musical production of Langston Hughes' Black Nativity is onstage at 7 p.m. at Fresh Fire from Heaven Christian Church, on Bull Street. Zach As the Monster is onstage tonight at Lulu's Chocolate Bar.