If you goofed around and didn't catch a performance of the comedic, murder mystery Shear Madness at Stage Door Theater the last go-round, you'd better get out for one of these added shows. The play, which features plain-out goofy characters played by a talented cast, revolves around the murder of an old lady who lives above the Shear Madness Salon. And best of all, it's an interactive show -- so you and the rest of the audience get to decide who-dun-it. Performances continue through Sept. 6. $29.50 and up. 7:30 p.m. Stage Door Theater, North College Street at 5th Street. 704-372-1000. www.blumenthalcenter.org.