• Fright Nights: Deer Valley High School transforms the gym into a spooky and ghoulish haunted house 7-10:30 p.m. Oct. 26-27, 4700 Lone Tree Way, Antioch. Cost is $5. 925-756-6700.

  • Tri Delta Haunted Bus Tours: A fun and frightening time with treats for ghouls and boys. No ticket is required to board the bus. Come on board if you dare! Tours: 5-8 p.m. Oct. 27; 4 p.m. Oct. 29, Railroad Book Depot, Pittsburg; 6:30 p.m. Oct. 30, Oakley Library. www.trideltatransit.com/promos/halloween.aspx.

  • Trunk or Treat: 1-4 p.m. Oct. 27. St. John's Lutheran Church and La Petite Academy host free Halloween activities, including games, treats, and fun for the whole family. St. John's parking lot, 1360 E. Tregallas Road, Antioch. Pumpkins and foods available for purchase. Proceeds benefit Make-A-Wish Foundation. 926 755-3070, 925 779-0110.

  • Costume Parade at Farmers Market: 11 a.m. Oct. 27, Old Town Plaza, Railroad Avenue. Treats, pumpkins, fun. All ages welcome. First 50 kids receive free pumpkins. 925-262-6930, www.pittsburgfoundation.org.

  • Century Plaza Spooktacular: 1-3 p.m. Oct. 27, Maya Cinema, 4085 Century Blvd., Pittsburg. Free movie, treats, jumpy houses, free pumpkin to first 250 kids in costume. Free. 925-432-7301.

  • Brentwood Hometown Halloween: 5-8 p.m. Oct. 27, First and Oak streets. Free trick-or-treating, haunted house, Tri Delta haunted bus, photos. Sponsored by Sutter Delta Medical Center, Brentwood Chamber of Commerce. Free. 925-634-3344, www.brentwoodchamber.com.

  • Antioch City Park Haunted House Fundraiser: 5-10 p.m. through Oct. 27, 2101 W. 10th St. Proceeds will fund rebuilding of vandalized park facilities. A terrifying haunted house, food, treats, fun and raffles. $5 per person. For information or sponsorship opportunities, call Josh Sauberman, 925-335-6076. www.antiochhauntedhouse.com.

  • Halloween Bash and Pumpkin Patch: Noon-5 p.m. Oct. 28, Small World Park, 2573 Harbor St., Pittsburg. Live music, magic show, pony rides, costume parade, treats, more. Adults $4, kids 12 and younger $2 (free with canned food item). All rides free. Details: 925-252-4842.

  • The Apocalypse is Here! Zombies Invade: 4:30-6:30 p.m. Oct. 30, Riverview Middle School, 205 Pacifica Ave., Bay Point. Zombies will come to party! Three live bands will perform for the afternoon in the multipurpose room. Dress your rottenest. Prizes will be awarded for the best zombie costume.

  • Hallelujah Fest: A a safe alternative to Halloween with booths, games, food, treats, jumpers, piñatas and more. Free. Dress in your most positive character costume for a chance to win a best-dressed contest. 7-9 p.m. Oct. 31, Word of Life Church, 4501 O'Hara Ave., Brentwood. 925-634-5433.

  • CC Café annual Halloween Lunch Party: 11:30 a.m. Oct. 31, Ambrose Community Center, 3105 Willow Pass Road, Bay Point. Costume contest, music, door prizes, lots of goodies. $2 donation; under age 60, $5. RSVP by 11:30 a.m. Oct. 30. 925-458-2662.

  • Circus Night: A free safe and sane alternative to Halloween 5-9 p.m. Oct. 31, Harvest Time Church, 2200 Ventura Drive, Brentwood. Treats, games, bicycle giveaway every 30 minutes. Hot dogs, popcorn, nachos for $1. 925-516-1908.