Friday night, guests will have the opportunity to experience two operas, a tragedy and a comedy, in one night. University of Louisville Opera will perform folk-opera "Down in the Valley," the tragic story of a teenage boy who falls in love after an Appalachian prayer meeting, and French opérette "Doctor Miracle," a comedy about a young man’s quest to marry his true love, the mayor’s daughter. Both plays are one act and will be performed Friday night at the Playhous Theatre.