Docents in the roles and costumes of 19th-century Tucson pioneers Petra Stevens, Leopoldo Carillo, Juan B. Elias and others discuss their lives and lead tours of their graves at 9 a.m., Saturday, March 19. $10. Betty Cook presents "Decoding Gravestones," from 11:30 a.m. to 12:30 p.m. $5. Refreshments are served. Proceeds benefit the Arizona Historical Society education programs. Reservations are requested by Friday, March 18. Call 886-3363, or e-mail firstname.lastname@example.org for more information.