We have changed how we collect and accept calendar information. Readers must now submit all items through our website. Go to events.contracostatimes.com, and click on "submit your event." You'll have to register at this point, then enter your event. You do not have to pay. Submitting your event in this way will ensure it is part of our easily searchable online database, as well as a candidate for space in our publications.

Free Bone Density Scan. The Foundation for Osteoporosis Research and Education, a community resource dedicated to end the suffering associated with osteoporosis, holds free bone density testing for people without health benefits. 8 a.m. to 3 p.m. March 1 and March 2. FORE, 1814 Franklin St., Oakland. 510-832-2663. fore.org.

White Elephant Sale. The Oakland Museum of California's annual White Elephant Sale, Northern California's biggest and best rummage sale, is back for its 55th year with something for everyone. 10 a.m. to 4 p.m. March 1 and March 2. White Elephant Sale Warehouse, 333 Lancaster St., Oakland. Free. Children under 12 must be accompanied by an adult. 510-536-6800, whiteelephantsale.org.

Introduction to Genealogy. Free genealogy class teaching the basics of searching for your ancestors. Each session tailored to the experience and needs of the participants. Arrive early to use the in-house computers with access to Ancestry.com and NewspaperARCHIVE.com. Tour the library's extensive holdings. Park for free in lot behind library. 1 p.m. March 1. California Genealogical Society and Library, 2201 Broadway, Oakland. 510-663-1358, californiaancestors.org.


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Crabstavaganza. Zion Lutheran School's annual fundraising crab feed, raffle, silent auction, and more featuring special guest host Joe Tuman. 5:30 p.m. March 1. Zion Lutheran School, 5201 Park Blvd., Piedmont. $60. Childcare available by reservation. 510-530-7909, www.zionlutheranschool.net.

Conservation Speaker: Saving the Puma. Oakland Zoo's Conservation Speaker Series looks at mountain lions in crisis, as humans encroach further into their habitat, and how scientists, landowners and state agencies are working together to minimize human-puma conflict, and foster a healthy coexistence. 7 p.m. March 5. Oakland Zoo, Marian Zimmer Auditorium, 9777 Golf Links Road, Oakland. $12-20, Sliding scale. 510-632-9525, x122, www.oaklandzoo.org.

Black History Film Premier and Book Launch. Named best documentary at this year's Arkansas Black Independent Film Festival, "Unearthing the Dream" highlights the history of a small black African American community and the black schools that existed before integration. Following the screening of the film, filmmaker Pam Uzzell and book author Ajuan Mance discuss the Malvern Legacy Project and their involvement in this unique public history initiative. 7 p.m. March 6. Danforth Auditorium Mills College, 5000 MacArthur Blvd., Oakland. Free. 510-430-2080, www.mills.edu.

Free Computer Tutoring. Brush up on your computer basics at free computer tutoring. 1 to 3 p.m. Saturdays. 4 to 6 p.m. Tuesdays. Rockridge Branch Library. 5366 College Ave., Oakland. 510-597-5017, www.oaklandlibrary.org.

Peralta Hacienda Kids Club. Kids from 5 to 15 can play and experience Oakland's original rancho through traditional arts and hands-on activities: Make adobe bricks and corn husk dolls, learn about native plants and make seed balls, traipse through the creek area and participate in other nature-based tours. 2:30 to 5 p.m. Saturdays. Peralta Hacienda Historical Park, 2465 34th Ave., Oakland. Free. 510-532-9142, www.peraltahacienda.org.