In "The Fabulous Lipitones," a long-running singing group loses a member and has to scurry to find a fill-in in time for Nationals. Much comedy ensues - especially since this show is created by John Markus, who was the head writer for "The Cosby Show" and writer/producer for "The Larry Sanders Show," and Mark St. Germain, who wrote the hit show "Freud's Last Session." The musical is running through June 2 at Goodspeed's Norma Terris Theatre. This weekend, performances are at 3 and 8 p.m. Saturday and 2 p.m. Sunday at the theater on North Main Street in Chester. It's 90 minutes with no intermission. Tickets start at $44. Call (860) 873-8668 or visit goodspeed.org.