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, 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.

Tween Time. Tweens entering fourth through eighth grade are invited to hang out in a space reserved especially for them with games, crafts, snacks, Legos and more. 1 to 3 p.m. July 11, 15 and 18. Alameda Free Library, 1550 Oak St., Alameda. Free. 510-747-7705, www.alamedafree.org

Teen D.I.Y. Workshop. As part of the Teen Summer Reading Program, this teen-taught D.I.Y. drop-in workshop shows you how to make and do things like modular origami, bookbinding and pop-up paper creations. 3 to 5 p.m. July 11. Alameda Free Library, 1550 Oak St., Alameda. Free. 510-747-7780, mconciatori@alamedaca.gov, www.alamedafree.org

Concerts at the Cove. Bring your lawn chairs, blankets and extra layer in case the evening bay breezes kick up and enjoy the Oakland-style funk sounds of BeaufunK with Michael Jeffries at East Bay Regional Park District's Concerts at the Cove music series. 5:30 to 7:30 p.m. July 11. Free. Crab Cove, 1252 McCay Ave., Alameda. 510-544-3187, www.ebparks.org.

Blood Drive. To combat the blood shortage that typically occurs in summer, the American Red Cross holds a blood drive. 8 a.m. to 2 p.m. July 12. Church of Jesus Christ of Latter-day Saints, 1201 Grand St., Alameda. redcrossblood.org.

Legos in the Library. Designed for kids in second grade and up, this program gives out a suggested challenge and the Legos, and kids add their imagination and building skills. 2 to 4 p.m. July 12. Alameda Free Library, 1550 Oak St., Alameda. Free. 510-747-7777, www.alamedafree.org

Make Your Own Musical Instrument. As part of the Teen Summer Reading Program, teens can build their very own usable musical instruments from everyday objects and junk, and then participate in a fun jam session. 6 to 8 p.m. July 14. Alameda Free Library, 1550 Oak St., Alameda. Free. 510-747-7780, mconciatori@alamedaca.gov, www.alamedafree.org

Teen Library Scavenger Hunt. As part of the Teen Summer Reading Program, the library's own Teen Advisory Board has created a fun and challenging scavenger hunt where teams compete for awesome prizes. 1 to 5 p.m. July 17. Alameda Free Library, 1550 Oak St., Alameda. Free. 510-747-7780, mconciatori@alamedaca.gov, www.alamedafree.org

Learn to Code. Have fun this summer learning to code at the library's ongoing summer coding series. All ages, skill levels welcome. No experience necessary. 2 to 5 p.m. Mondays and Wednesdays. 11 a.m. to 1 p.m. Fridays. 1 to 5 p.m. Sundays. Alameda Free Library, 1550 Oak St., Alameda. Free. 510-747-7777, www.alamedafree.org.