A non-Halloween costume party and sing-along fundraiser is set Sunday as Wild Horse Productions presents Sing-A-Long “Wizard of Oz” at Carson City’s Galaxy Fandango Theater complex.Billed as a new and interactive theatrical film experience, the show combines audience participation with the beloved 1939 film featuring Dorothy and her trip to the land of Oz.Young and old alike are encouraged to dress up as their favorite Wizard of Oz characters and there will be an Oz costume contest at 6 p.m. The event starts at 5:30 p.m. with a yellow brick road planned to lead people into the theater. Screening of …