Mercer Theatre presents The Blessed Demon, an interactive fantasy experience. Showtimes are Aug. 22-24, Aug. 29-31 @ 7:30 p.m., and Aug. 24 & Sept. 1 @ 2:30 p.m.. Tickets are $15, or $10 for students. To purchase in advance, tickets.mercer.edu; tickets are available at the door. All shows are at Tattnall Square Center for the…