Illusion: A Fool's Paradise features entertainment by O/W/L/S, Meow Mixx, Cirque Roots, the Human Project, SwitchBlade Parade, Flight School and others; and Tempest DuJour hosts an evening of vintage game shows, at 9 p.m., Saturday, Oct. 13; $5. A prize is awarded for the best costume representing an illusion. Visit fluxxproductionsstudioandgallery.tumblr.com for more information.