Adapted from the celebrated Ingmar Bergman film “Smiles of a Summer Night,” A Little Night Music follows actress Desirée Armfeldt, the affairs she is entangled in, and the men who love her. When everyone gathers at the country estate of her mother, new romances and second chances bloom in surprising ways. Full of hilariously witty and heartbreakingly moving moments of adoration, regret and desire, this comedy for adults is most noted for introducing the standard “Send in the Clowns.”