SPECIAL: September 18, 19 - USSS - US Speedway Series at PPIR Pikes Peak International Raceway on I-25 south of Colorado Springs open track event open to all cars. I found this at
www.cruisenights.com/schedule.htm
Also the CECA Colorado Exotic Car Assoc.
sometimes has an open track event at PPIR. Currently they do not have one planed at PPIR from what I can see.