“Christmas as calamity” is Taylor Mac’s approach to the holidays and their attendant songs in this musical, maniacal show—and some form of audience participation is likely, so brace yourself. A Pulitzer Prize nominee and MacArthur “Genius” grant recipient, this NYC-based playwright, actor and cabaret performer is known for A 24-Decade History of Popular Music, which dissects, challenges and queers American history through its songs, devoting an hour to each decade and 10 songs to each hour. Mac did perform the show in its roiling 24-hour entirety once, to extravagant acclaim, but most often has performed segments of a few hours (and a few decades) at a time. Holiday Sauce is the latest installment of that epic project. 12/19–12/20. 8 p.m. Prices vary. The Moore Theatre, downtown; stgpresents.org