On Saturday, Bruno Mars, Train and others perform at the Preakness Infield at Pimlico Race Track, 5201 Park Heights Ave. A schedule of performances is here. Tickets start at $40. Also: Jason Aldean performs at Jiffy Lube Live. The show, which starts at 4 p.m., is sold out, but is part of the venue's Country Megaticket package. Look for our, already teased, interview with Aldean later this week.