We have changed how we collect and accept calendar information. Readers must now submit all items through our website. Go to events.contracostatimes.com, then click on "submit your event." You'll have to register at this point and then enter your event, but you don't 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.

Plant Exchange. Want an instant new garden? Bring your plants and pick up new ones. All types and sizes of healthy plants welcome, from small cuttings up to full size. Noon to 4 p.m. March 29. First Presbyterian Church, 2619 Broadway, Oakland. 510-866-8482, theplantexchange.com.

Pacific Mozart Ensemble. Known as the Bay Area's most innovative chorus, the Pacific Mozart Ensemble delivers passionate and engaging choral performances. 7:30 p.m. March 29. Holy Names University, Regent's Theater, 5900 Mountain Blvd., Oakland. $35 to $40. 510-845-4444, www.fsarts.org.

Cohen Bray House Monthly Tour. The Cohen Bray House, built in 1884, features wedding gifts, books, clothes and household artifacts from the past 130 years. Spend time in each room and learn about the house's history. There is no heating, warm dress recommended. 2 p.m. March 30. Cohen Bray House, 1440 29th Ave., Oakland. $5. 510-536-1703, cohenbrayhouse.info.

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.

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.