Camp Jabberwocky, widely regarded as the first American sleepover summer camp for the disabled, has been staging summer plays for years. This year's performance was Back to the Future, a reinterpretation of the 1985 movie that featured, willy-nilly, twin McFlys (Marty and Arty), a regiment of robots, Elvis Presley from the Vegas years as well as the Beatles from the Sullivan moment.