(Casinos have an advantage over other music venues, since they can make up losses on ticket sales via gambling revenue.) They booked so many summer shows, in fact, they left the Minnesota State Fair with pickings slim enough to choose the Spandex-clad cover band Hairball - ironically, a casino staple - for one of its Saturday night grandstand concerts. Treasure Island Resort & Casino and Mystic Lake Casino Hotel each got more ambitious about their bookings to try to attract summer concert crowds. If all those Counting Crows, Deep Purple and Lady Antebellum billboards and ads around town haven’t clued you in already, the two casinos nearest to the Twin Cities have doubled down on their outdoor concert offerings this summer.