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." You'll have to 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 easy online searchable database, as well as a candidate for space in our publications.

Hip-Hop at the Library. Pep Love of Hieroglyphics performs positive hip-hop music, a DJ spins and mixes tracks, refreshments are served, and all ages -- especially teens and young adults -- are invited to this evening of free entertainment. 6:30 to 8 p.m. April 25. South Branch, Berkeley Public Library, 1901 Russell St. Free. 510-981-6260, ww.berkeleypubliclibrary.org.

Architects and Authors Max Jacobson and Shelley Brock. Max Jacobson, founding partner at JSWD Architects, and Shelley Brock, LEED-certified founder of Shelley Brock Architecture, prove that architecture isn't just for architects with "Invitation to Architecture." 7 p.m. April 25. Books Inc., 1760 Fourth St. Free. 510-525-7777, booksinc.net.

Author Justin Go. Author Justin Go reads from "The Steady Running of the Hour." 7:30 p.m. April 25. Mrs. Dalloway's, 2904 College Ave. 510-704-8222, www.mrsdalloways.com.

Earth Day Shoreline Cleanup. Volunteers are invited to help clean up the Berkeley Shoreline as part of Earth Day celebrations. 9 a.m. to noon. April 26. Meet at Shorebird Park Nature Center, 160 University Ave. Registration required. 510-981-6720, www.ci.berkeley.ca.us.

Emergency Prep Fair. Learn how to keep your families, kids and pets safe in a disaster at a free communitywide event for people at all levels of preparedness featuring family friendly activities, tips and information, on-site training, interactive demonstrations of safety resources, a showcase of emergency vehicles, prizes, kids activities, a blood drive and more. 10 a.m. to 2 p.m. April 26. North Berkeley BART Station, 1750 Sacramento St. Free. 510-981-5506, www.ci.berkeley.ca.us.

Heart 2 Heart Neighborhood Celebration. The city co-hosts a block party featuring blood pressure screenings, free food, fun, health information, drug take-back disposal, and more. 10 a.m. to 3 p.m. April 26. Oregon Street between Dohr and Sacramento streets. Berkeley. Free. 510-981-2489, www.ci.berkeley.ca.us.

Walt Whitman: America's Poet of the Open Road. Writer and actor Tim Holt takes on the role of Walt Whitman, presenting his life and work in poetry and prose while celebrating the energy, sprawling expanse and diversity of America in the mid-19th century. 2 to 4 p.m. April 26. Berkeley Public Library, 2090 Kittredge St. Free. 510-981-6278, www.berkeleypubliclibrary.org.

Young Scientists: Amazing Elephants. Kids 4 to 7 years old can explore the science and math of elephants at activity stations and join in for an elephant dance. 3:30 to 4:30 p.m. April 28. Berkeley Public Library, 2090 Kittredge St. Free. 510-981-6223, www.berkeleypubliclibrary.org.

Computers for Beginners. Learn how to use the mouse, use the keyboard, set up email and search the Internet at this free, drop-in class in a relaxed atmosphere. 10 to 11 a.m. Thursdays. Berkeley Public Library, 2090 Kittredge St. Free. 510-981-6148, www.berkeleypubliclibrary.org.