The popular Great Halloween Race, set for October 13 now has a half marathon distance. This 5th annual race also includes a 10K, which is Missouri’s largest, a 5K and a 1-Mile Fun Run. One of the most exciting features is the new race course, which was designed to showcase the riverfront. Here’s your chance to run in the shadow of the Gateway Arch and along the Mississippi Riverfront. Hurry, registration is now open, and capped at 2,500 for the 13.1 distance.