Maestro Robb Woulfe always includes performance art as part of the Ann Arbor Summer Festival. This year it’s the latest wild-ride happening by the incredible Taylor Mac: Comparison is Violence, or The Ziggy Stardust Meets Tiny Tim Songbook. (Saturday, July 2, 8:00 pm at the Lydia Mendelssohn Theater in the Michigan League.) Technically, performance art is any situation that involves four elements: time, space, the performer’s body and a relationship between the performer and an audience. It’s close to the performing arts, but has been called the “antithesis of theater” in that it cannot be repeated and generally has conceptual, content-based meaning. To see videos of some of the songs from this show, and from other of his performances www.annarborsummerfestival.org. 734-678-7976.