Each summer, the Rock & Roll Hall of Fame hosts a variety of indie and alternative rock acts on its outdoor plaza. Tonight, area reggae acts Umojah Nation and Jah Messengers will perform. The concert takes place from 6 to 9 p.m. and prior to the concert, the Rock Hall will host a Q&A with the acts slated to play. The concerts are free — as a bonus, local residents and college students can purchase admission to the Rock Hall for a mere $5. (Niesel)