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.

Trail Maintenance Weekend. Spend a few hours or a few days at the first full weekend project of the season at Anthony Chabot Regional Park working with the East Bay Regional Park District and the Bicycle Trails Council of the East Bay. Tools, gloves, instruction and meals provided. Optional camping Friday and Saturday. No experience necessary. 5 p.m. May 16 through May 18. Anthony Chabot Park, Redwood Road and Skyline Boulevard, Oakland. 650-298-9774, http://v-o-cal.org/projects/2014/anthonyChabot.html.


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Creek Crew Work Day. Grab your gardening gloves and help clean up the creek. Bring your closed-toe shoes, work clothes, water and snacks, and tools if you have them. 9 a.m. to noon. May 17. Arroyo Viejo Creek, Oakland Zoo, 9777 Golf Links Road, Oakland. RSVP encouraged. 510-632-9525, ext. 209, Chantal@oaklandzoo.org.

Peace Budget for a Peace Economy. Peace Action West's Executive Director Jon Rainwater leads a discussion on how to create a peace budget, and how it's time to re-thick our priorities. 2:30 to 4 p.m. May 17. Rockridge Library, 5366 College Ave., Oakland. Free. 510-339-1395, www.oaklandlibrary.org.

Celebrating Elephants Reception. The Oakland Zoo's 18th Annual Celebrating Elephants evening event to raise awareness and funds for the magnificent African elephant features Dr. Vicki Fishlock, Research Associate, Amboseli Trust for Elephants as inspirational guest speaker. Evening includes refreshments and auction items. 6 to 9 p.m. May 17. Oakland Zoo, Marian Zimmer Auditorium, 9777 Golf Links Road, Oakland. $40. 510-632-9525, ext. 122, www.oaklandzoo.org.

Dragonflies: Lives, Loves, and Care. Dragonfly expert Kathy Biggs mesmerizes with stories about dragonflies and their fascinating lives. Also, learn how you can support their life cycle by creating habitat for them. 7 p.m. May 21. Dimond Branch Library, 3565 Fruitvale Ave., Oakland. Free. 510-501-3672, www.sausalcreek.org.

Uptown Farmers Market. The Uptown Oakland Farmers' Market returns for the season with fresh local produce, music, kids' activities and more. 10 a.m. to 2 p.m. Wednesdays. Ordway Plaza, Kaiser Building, 2150 Valdez St., Oakland. 800-949-FARM, www.pcfma.com.

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.

PHS 30th Reunion. Advance ticket purchase is a must for Piedmont High School's class of 1984 30th reunion celebration. 6 to 11 p.m. June 21. Piedmont Community Hall, 711 Highland Ave., Piedmont. $100. lpwillerup@ft.newyorklife.com or keithbarlow@sbcglobal.net.