Improvisational performer and teacher Martin Zeller offers a 5-hour improvisational theater workshop from 9:30 a.m. to noon and 1 to 3:30 p.m. May 18 at the Art Barn, 1060 East End Road. The fee is $40 for the class. Zeller was the founder and director of Fresh Produce, an improv troupe, and was artistic director and performed with Blue Door Theatre in Spokane, Wash. The workshop introduces and explores the skills and concepts of improvisation. For information and to register, call Zeller at 235-6589 or (509) 294-0451.