Kart Racing For Heroes Kick-off Event! Sunday, February 24, 2013 8:00 AM 8:00 PM 08:00 20:00 Unser Racing 7300 Broadway St Denver, CO, 80221 United States (map) Google Calendar ICS On the same day as the Indy 500! Racers need to make sure to register here and enter the Event Code 76348. Click here for more information. Track website: Unser Racing.