Curtis A. pulled together musicians to sing Lennon songs on the 7th Street exit the day Lennon was shot. He will have another show tonight, 20 years after that shot. Shakespeare's "Cymbeline" is performed Ten Thousand Things Theater Company to people who don't usually see productions, such as prisoners. Surf-cracker is a spin of Tchaikovsky's "Nutcracker" at the Loring Playhouse.