Fairy tale showcase for young actors

ON STAGE—Cassidy May Benullo is Lady Larken and Liam Krainman plays Sir Harry in “Once Upon a Mattress” in Calabasas. Courtesy of Patrick Garrett

The musical fairy tale spoof “Once Upon a Mattress” made a star out of Carol Burnett 60 years ago, and since then many multi-talented actors have used the show to demonstrate their performing versatility.

The role of Princess Winnifred (or “Fred,” as she prefers to call herself) relies on a deft combination of comedic ability, a powerful singing ...