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The Oklahoma Aquarium is excited to celebrate our 19th annual HallowMarine this year. This fantastic, week-long indoor trick-or-treating event is fun for all ages and kicks off on October 25 and continues through October 31. Each evening from 6:30 - 9:00 p.m. our guests trick-or-treat at sponsor tables throughout the aquarium and see our fascinating marine life in the surrounding exhibits. Dress up in your best Halloween costume for a chance to win prizes, and join us for the opportunity to interact with some of the ocean's most curious creatures from the deep!