Don Denton, Marty McNamee, Danny White, and Scott Stratton in Plaid TidingsI've never seen a production of Forever Plaid, but that didn't seem to affect my enjoyment of the Circa '21 Dinner Playhouse's production of the musical's sequel, Plaid Tidings. Thanks to a quick recap of the events from its predecessor, it was immediately clear that this show would concern a 1950s vocal quartet that had died, but was sent back to Earth to perform a Christmas show in order to prove their Plaid-itude. Or something like that.