Mopar Festival Of Speed, Willow Springs, middle of April every year, on a damn Thursday. Limited to 40 race cars, or cars that can race

Anybody can sign up, as long as they own a helmet, a Mopar and have $300 for the track rental.

This isn’t a parking lot autocross, it's a 2.5-mile, 9-turn road course with significant elevation changes and blind corners.

http://www.hotrod.com/events/1604-worlds-biggest-mopar-open-track-day-hits-willow-springs/