Signature Theatre's Target Open House, an annual all-day extravaganza of free performances, classes, demonstrations and exhibits returns. This year's activities include a Broadway-style "Signature Idol" contest to be judged by Signature's Eric Schaeffer and Washington Post theater critic Peter Marks as well as TLC's What Not to Wear co-host Clinton Kelly, who will also emcee the day's finale Broadway Concert. Also on tap is a performance by Rick Hammerly of his favorite songs from Hedwig & The Angry Inch. Saturday, July 17, from noon to 10 p.m. Signature Theatre, 4200 Campbell Ave., Arlington. Tickets are free. Call 703-820-9771 or visit signature-theatre.org.