Halloween family fun
8 p.m. Oct. 31. One-hour Clayton Ghost Walk, meet Endeavor Hall, 6008 Center St., Clayton. Bring flashlight. Costumes optional. Participants get "I survived ghost walk" certificate. 925-228-9144.
Shoppers visit Todos Santos Plaza stores, vote for favorite scarecrow through Oct. 31. Participating businesses fly orange, black balloons. Children trick-or-treat at plaza businesses 3-5 p.m. Oct. 31. 925-685-4221, www.ci.concord.ca.us.
5-8 p.m. Oct. 27, Calvary Temple Church, 4725 Evora Road, Concord. Carnival, hay, horse rides; games, face painting, costume contest. $5. 925-458-9100, calvarytemple.org.
6-8:30 p.m. Oct. 31, Grace Free Will Baptist Church, 2875 The Alameda, Concord. Free hot dogs, candy. 925-676-5856. firstname.lastname@example.org.
1-5 p.m. Oct. 27, East Bay Animal Rescue & Refuge 2885 Concord Blvd., Concord. Dog, cat, human costume contests. Cat entries submit video, photos, email@example.com. Judging 2 p.m. Food for purchase. Funds help EBARR. $5-$15. www.ebarr.org/SpecialEvents.html. 925-429-2785.
Music studios relaunch
Drug take back
Drop off unused, unwanted, prescription drugs 10 a.m.-2 p.m. Oct. 26, Concord Police Department, 1350 Galindo St., Concord. Anonymous. No syringes. 925-671-5067.
Donations for troops
Contra Costa Blue Star Moms collecting items for deployed overseas troops. Drop off at A-1 Self Storage, 5296 Concord Blvd., Concord by Nov. 16. Postage cash donations needed. For a full list, call 925-686-3944, ccbluestarmoms.org.
Dana Estates Neighborhood Alliance craft fair 10 a.m.-3 p.m. Oct. 26, Dana Plaza, 4115 Concord Blvd., Concord. Vendors, home decor, baby times, art, www.danaestates.org., www.facebook.com/DanaEstates.
Adopt a great friend
ARF Fall in Love Adoption 2890 Michell Drive, Walnut Creek.
noon-5 p.m. Wednesday; 3-7 p.m. Thursday-Friday; noon-5 p.m. Saturday-Sunday through October, Adoption fee $50 for six months, older. 925-256-1273, www.arf.net.
Library book sale
Clayton Library book sale 10 a.m.-6 p.m. Oct. 26; noon-4 p.m. Oct. 27, Clayton Library, 6125 Clayton Road. Books 50 cents-$1. Most books half-price on Sunday. 925-673-0659.
First Church of Christ, Scientist's Divine Love: Answer to Universal Health by Jose de Dios Mata, 3-4:30 p.m. Oct. 27, Concord Library, 2900 Salvio St. Spanish with English translation. Free. Child care, refreshments, parking.
Diablo Valley Democrats host Supervisor Karen Mitchoff 7 p.m. Oct. 24, Ygnacio Valley Library, 2661 Oak Grove Road, Walnut Creek. State of county, fire protection, justice system, more. Free. 925-946-0469, wwwdvdems.org.
First Presbyterian Church of Concord's free piano concert with Ken Medema, 6:30 p.m. Oct. 27, 1965 Colfax St. Freewill offering. 925-676-7177.
Hands Only CPR 7:30 p.m. Oct. 28, Clayton Library, 6125 Clayton Road. Clayton CERT. Clayton AAUW, Clayton Library Foundation sponsor. Free. No registration. 925-686-5513.