Charles Busch’s fizzy new work, The Tribute Artist, is really light summer fare, but since it has shown up to make this brutal winter a lot cheerier for a couple of hours, who’s going to complain? In his latest outing, Busch, who usually plays female characters, is Jimmy Nichols, a gay drag performer—or, as Jimmy prefers, “tribute artist”—who has been canned from his longtime job at a Las Vegas revue. The solid comedy he has constructed is rather like Charley’s Aunt for the 21st century, with nods to Arsenic and Old Lace and Weekend at Bernie’s.