American Ballet Theatre, Symphonie Concertante/The Dream (Metropolitan Opera House, Lincoln Center, Monday-Thursday). Frederick Ashton’s one-act version of A Midsummer Night’s Dream isn’t as choreographically or structurally innovative as George Balanchine’s full-evening ballet, but it has a sweetness and charm all its own. ABT is pairing it with one of the few dances made by Balanchine to a Mozart score, set to the great double concerto for violin and viola (TT).