Information via Go! St. Louis: "The annual 5K (3.1 miles) race is held in April as part of the GO! St. Louis Marathon & Family Fitness Weekend and takes place on Family Fitness Day in Forest Park. The 5K is one of the most diverse events, with all ages and fitness levels joining together to compete. The 5K traditionally sells out in advance of the race, so sign up early to secure your spot. Please note that the participation cap for the 2014 race is 3,000 individuals." Click the above-mentioned link for more.