Chris Clarke and Bob Petee combine to portray 20 different characters in "Greater Tuna," The first of four major shows planned for the Pendragon Theater's summer season. The production opens June 5. Ticket prices for are $20 for adults, $16 for seniors and students, and $10 for those 17 and under. Matinee seats are $12. For more information or to place a reservation, call 891-1854 or e-mail firstname.lastname@example.org.