The Tar Heel Sports Car Club used to have a night series about once a month at the RBC Center in Raleigh. It was a low key series limited in participation and never thoroughly scored. There were no trophies. But it was a heck of a lot of fun. This run isn't terribly great, but I submit that this is some of the most fun you can have at a max of 45MPH on a weeknight (well, and with your clothes on...I think mine were on, anyway!).
This was circa 2004 in a Toyota Spyder, fairly stock (though it somewhat obviously has a straight pipe and Supertrapp on it) and on street tires.