“The Drowsy Chaperone,” which opened Friday at Spokane’s Civic Theatre, is a trifle, an entertainment, one that lets its audience in on the joke, is free with the winks and nods, and benefits greatly from high-spirited performances all around. The musical comedy, which opened on Broadway in 2006, is a play within a play. It centers on a lonely man, called only Man in Chair (Thomas Heppler), who is sitting in his shabby apartment feeling blue. So he pulls out a record – a real record – and begins to play the original cast recording of a 1928 musical called “The Drowsy Chaperone.” We hear static as the record needle hits the vinyl – “I love static,” the man tells us, “it’s the sound of a time machine starting up” – and quickly the characters of “The Drowsy Chaperone” come alive in his mind and on the stage.