Always adventurous, always classy, The In Series presents a provocative "pocket opera" double-bill of William Bolcom & Arnold Weinstein's Casino Paradise and Leonard Bernstein's Trouble in Tahiti , offering up a delicious evening of longing, illusion, gangsters and greed. Nick Olcott directs. Weekends to Oct. 2. Source, 1835 14th St. NW. Tickets are $39. Call 202-204-7760 or visit inseries.org.