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, 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.

Crew Creek Work Day. Volunteers needed to clean up Arroyo Viejo Creek. Don gardening gloves, wear closed-toe shoes and work clothes, bring water and snacks. Chaperones needed for youth volunteers. At noon, folks get a free pass to the Oakland Zoo. RSVP appreciated. 9 a.m. to noon. April 19. Oakland Zoo, 9777 Golf Links Road, Oakland. 510-632-9525, chantal@oaklandzoo.org.

The Great Egg Hunt. It's a full day of fun when the Easter Bunny hops by for the egg hunt, clown stilt walkers, games, face-paining, arts and crafts and more. 11 a.m. to 3 p.m. April 19. Dunsmuir Hellman Historic Estate, 2960 Peralta Oaks Court, Oakland. Adults $5. Kids $3. Ages and under free. 510-615-5555, www.dunsmuir-hellman.com.

27th Annual Lakeshore Easter Derby Parade and Spring Festival. Time for kiddies to decorate their derbies again and stroll down Lakeshore in the Easter Parade. 10 a.m. to 1 p.m. April 19. Lakeshore Ave. Baptist Church, 3534 Lakeshore Ave., Oakland. $2 per hat, festival free. 510-593-3721, LakeshoreOakland.com.

American Rhododendron Society Flower Show and Sale. Flower show & plant sale of the American Rhododendron Society with thousands of flowers, rare and unusuals. Experts on hand to answer questions. Noon to 4 p.m. April 19. Oakland's Lakeside Garden Center-Lake Merritt, 666 Bellevue Ave., Oakland. Free. 510-582-3404, www.calchapterars.org.

Zoovie Night. Jump in your jammies and bring your blankets and chairs to meet some nocturnal education animals, drink hot cocoa, eat popcorn and watch the family friendly movie, "Fern Gully." 6:30 to 9:30 p.m. April 26. Oakland Zoo, 9777 Golf Links Road, Oakland. Registration required. $7. 510-632-9525, ext. 220, www.oaklandzoo.org.

Oakland's Annual Earth Day. Do your part to make Oakland cleaner and greener. Volunteers fan out to over 80 locations throughout the City. 9 a.m. to Noon April 26. Morcom Rose Garden & Other Sites Throughout Oakland, 700 Jean St., Oakland. Free. 510-238-7611, www.oaklandearthday.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. 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. $100. Piedmont Commumnity Hall, 711 Highland Ave., Piedmont. lpwillerup@ft.newyorklife.com or keithbarlow@sbcglobal.net.