Signature Theatre hosts Signature Sings, a special cabaret series throughout the season to celebrate its 20 years of musical theater. Next up: select songs from Sondheim productions during the company's second five years, including Cabaret, Passion, The Rink, Sunday in the Park with George and A Little Night Music. Opens Tuesday, Nov. 17, at 8:30 p.m. To Sunday, Nov. 22. Signature Theatre, 4200 Campbell Ave., Arlington. Tickets $33. Call 703-820-9771 or visit signature-theatre.org.