We have changed how we collect and accept calendar information. Readers must now submit all items through our website. Go to events.contracostatimes.com, click on "submit your event," register at this point and 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.

Library Lego Mania. Kids can design, build and explore with hundreds of Legos in the Piedmont Avenue Branch's Lego club. 3 to 5 p.m. April 4. Piedmont Avenue Branch, 80 Echo Ave., Oakland. 510-597-5011, www.oaklandlibrary.org.

North Hills Community Association. Session 3 meeting of the North Hills Community Association discusses "After Disaster Strikes: The Road to Recovery." 10 to 11:30 a.m. April 5. College Preparatory School auditorium, 6100 Broadway, Oakland.

Cambodian New Year Celebration. Lively musical celebration showcasing Cambodian elders performing the nearly-lost musical arts of the Khmer, as well as the art of a younger generation, transforming and maintaining these traditions through hip-hop and dance. Also, Cambodian games for kids and adults, food and crafts. 10 a.m. to 5 p.m. April 5. Peralta Hacienda Historical Park, 2465 34th Ave., Oakland. Free. 510-532-9142, www.peraltahacienda.org.


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Blood Drive Volunteer Orientation. Volunteer orientation for those interested in assisting with blood donors, delivering blood and helping with special projects. Advance sign-up required. 10 a.m. April 9. Oakland Blood Donation Center, 6230 Claremont Ave., Oakland. 510-594-5165, anne.blackstone@redcross.org.

Oakland Public Library Book Sale. The Bookmark Bookstore's semiannual book sale features scores of books at reduced prices. Prices get slashed as the sale goes on. Members get special rates. 10:30 a.m. to 5:30 p.m. April 10 through April 13. The Bookmark Bookstore Friends of the Library, 721 Washington St., Oakland. Free. 510-444-0473, fopl.org/bookmarkbookstore.

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.