LECTURES ARIZONA HISTORICAL SOCIETY. 949 E. Second St. 628-5775. Mark Santiago, director of the New Mexico Museum of Space History, presents Esteemed in Importance: The Antebellum History of Fort Yuma, 1850-1861 July 18 from 7 to 9 p.m. Santiago discusses Fort Yuma's importance as a post securing the area against hostile Indian tribes, Mexican revolutionaries and American and French filibusters and more. Admission costs $6, $5 for Historical Society members and $3 for students with I.D. The entire lecture series costs $30 for members, $36 for nonmembers and $18 for students. Call for more information. SIBLING TRAUMA AND GRIEF. Duval Auditorium, University Medical Center. 1501 N. Campbell Ave. 886-6046. Patty Harada presents Trauma and Grief about Our Siblings July 18 from 7 to 9 p.m. Cost of the lecture is $10 at the door. For more information call or e-mail patti@lovematters.net or visit www.lovematters.net.

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