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Crowne Plaza Concord/Walnut Creek - Concord will host Contra Costa Halloween Con on Sunday 27th October 2024, 10:00AM in Concord, California. Select your Contra Costa Halloween Con tickets above using our secure ticket checkout. Your Crowne Plaza Concord/Walnut Creek - Concord tickets will arrive before the Contra Costa Halloween Con event on Sunday 27th October 2024, 10:00AM.