The In Series's "pocket opera" provocative double-bill of William Bolcom & Arnold Weinstein's Casino Paridise and Leonard Bernstein's Trouble In Tahiti provides an evening of longing, illusion, gangsters and greed. Nick Olcott directs. Closes this weekend. Source, 1835 14th St. NW. Tickets are $39. Call 202-204-7760 or visit inseries.org.