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

ACC Spring Concert. Alameda Community Chorus' Spring Concert, "Thy Dwelling Place," features music from the Beatles, Billy Joel, Brahms, Barber, Bernstein and Broadway. 7:30 to 9:30 p.m. May 9. Kofman Auditorium, 2200 Central Ave., Alameda. Free. 510-522-3842.

Park Street Spring Festival. Park Street District's annual Mother's Day fair features over 150 arts and craft booths, two live music stages, fabulous festival fare, a cool kids' area, and much more. 10 a.m. to 6 p.m. May 10 and May 11. Park Street, between Lincoln and Encinal avenues, Alameda. Free. 510-523-1392, shopparkstreet.com.

Waterwise Gardening. Lori Caldwell discusses permaculture and sustainable techniques for the garden, like sheet-mulching, compost, bio-intensive edible gardening and more. For teens and adults. RSVP requested. 2 to 4 p.m. May 10. Alameda Free Library, 1550 Oak St., Alameda. Free. 510-747-7713, www.cityofalamedaca.gov.

Author Kaui Hart Hemmings. Kaui Hart Hemmings, New York Times-bestselling author of "The Descendants" -- which was adapted into an Academy Award-winning film starring George Clooney -- shares her much-anticipated follow-up novel, "The Possibilities." 7 p.m. May 14. Books Inc., 1344 Park St., Alameda. Free. 510-522-2226, www.booksinc.net.

Fall Prevention. Donna Murray, occupational therapist in the rehabilitation department at Alameda Hospital, discusses fall prevention, including home safety and exercise. Registration required. 1 p.m. May 15. Mastick Senior Center, 1155 Santa Clara Ave., Alameda. Free. 510-747-7506, www.mastickcenter.com.

Library Book Sale. Friends of the Alameda Free Library's used book sale features thousands of gently used books of all genres, children's books galore, DVDs, records and more. Sunday is clearance day. 9 a.m. to 4 p.m. May 17. Noon to 4 p.m. May 18. Free. Albert H. DeWitt Officers' Club, 641 West Redline Ave., Alameda Point. www.friendsalamedafreelibrary.org.