Master Class – The Oshawa Little Theatre is presenting its Master Class. The Opera Diva, Maria Callas, a glamorous, commanding, larger than life, caustic, and surprisingly funny pedagogue, is holding a singing master class. Alternately dismayed and impressed by the students who parade before her, she retreats into recollections about the glories of her own life and career. Included in her musings are her younger years as an ugly duckling, her fierce hatred of her rivals, the unforgiving press that savaged her early performance, her triumphs at La Scala, and her relationship with Aristotle Onassis. It culminates in a monologue about sacrifice taken in the name of art. There are classes running until Oct. It runs from 7:30 to 10 p.m. at 62 Russett Avenue. Tickets are $15 or $25.