CONTRA COSTA COUNTY, Calif. — October 30, 2026. Saturday celebrations in Contra Costa County range from a free daytime downtown street activity in Pleasant Hill to a separately ticketed Sunday convention in Concord. Dates matter: Lafayette’s advertised Trick or Treat Street was on Friday, not Saturday.
Saturday, October 31: what is actually scheduled
Downtown Pleasant Hill Halloween Spooktacular
When: Saturday, Oct. 31, noon–2 p.m.. Where: Downtown Pleasant Hill.
The regional county events calendar lists a free downtown family festival with Halloween activities. Source and last-minute checks.
Dave and Boo-ster’s Boo Bash
When: Saturday, Oct. 31, 10 a.m.–1 p.m.. Where: 2075 Diamond Boulevard, Concord.
A separately listed themed indoor event; contact the venue to confirm what games and admission conditions apply. Source and last-minute checks.
Día de los Muertos in Antioch
When: Sunday, Nov. 1, 1–5 p.m.. Where: Nick Rodriguez Center, Antioch.
A Sunday cultural remembrance event, not an extension of Saturday trick-or-treating. Source and last-minute checks.
Plan your Halloween day
If attending with young children, the Pleasant Hill midday window is the best straightforward community outing. A family can choose Concord instead, but the two times overlap. Saturday’s events and Sunday’s remembrance have different purposes; check specific organizer terms and parking.
Sunday, November 1, and other options
Visit Concord also advertises an adult nightlife party after 9 p.m. on Saturday, which should not be presented as a children’s event.
Verify before traveling
The date of Halloween is Saturday, October 31, 2026. A program held on Friday, October 30, should not be mistaken for a Saturday event. Organizers may change hours, fees or locations. Confirm the latest calendar and any required booking; some tourism and community calendars aggregate submitted listings rather than manage the event themselves. Keep children’s costumes visible, use marked crossings and plan for autumn darkness. For live state-road conditions use Caltrans QuickMap.
Find Contra Costa County’s year-round reporting. Corrections and original source documents: california58com@gmail.com.
California58 Halloween weekend guide. Organizer and community-calendar sources linked per event; research checked October 30, 2026. No unsourced parade or unverified current-hours claim is presented as confirmed.
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