3ballsracing is hosting a non-competative track day April 20 at Gingerman raceway in South Haven, Michigan.
I've been to several events with these guys and they're a lot of fun. I usually get about 2hrs of track time depending on weather and attendance. They always have a variety of cars, experience levels and people. Instructors are available for free and lunch is provided (pizza, water, and sports drinks).
Convertibles are welcome. Rollbars are encourages, but not required. It's a great way to get into HPDE's.
for more info see:
3BallsRacing.com
-Doug