Hurry if you want to participate in St. Louis Most Festive Race. The 6th Annual Great GO! St. Louis Halloween Race is set for October 12, and features a Half Marathon, 10K, 5K and a 1-Mile Fun Run. Here’s your chance to dress up in your favorite Halloween costume with 7,000 other participants and have some fun in downtown St. Louis. Post-race festivities include a costume contest with great prizes, chocolate, pumpkin pies for age group prizes, live music, Michelob ULTRA beer and everyone who finishes receives a top-quality medal. Register, Event Details, Watch the highlight video