MY FAIR LADY at the Shubert: Closes May 20. Evenings at 8:30. HA 6-4520.
KRAPP'S LAST TAPE and NO EXIT at the Charles Playhouse: Samuel Beckett and Jean-Paul Sartre provide an evening of ingenuous optimism. Tuesday through Friday at 8:30. Wednesday matinee at 2:30. Saturday 5:30 and 9; Sunday, 2. DE 89393.
THE BOY FRIEND at the Bradford Hotel Roof Theatre: First Bos- ton engagement of Sandy Wilson's spoof on the Twenties, Pre-curtain dinner and dancing plus dancing after the show. Eves. at 8:40. HA 6-1400.
THREE MODERN NOH PLAYS at the Loeb: American premiere presented by the Poets' Theatre. Through May 20 at 8:30. UN 4-2135