Troupers Light Opera Company will hold auditions for a semi-staged production of Gilbert and Sullivan's operetta Thespis. Audition dates are Monday, Aug. 22 and Wednesday, Aug. 24, from 7 to 10 p.m. Many singing parts are open. For an audition, visit trouperslightopera.org. \u00a0 Rehearsals will begin Monday, Sept. 12. Performances will be Nov. 5 and 6 at All Saints Catholic School in Norwalk.