sportbike track time goes there quite a bit, thats who's organizing this one. I know of a few others as well. No membership fees to ACC (that i know of lol), but I think they have a $5 gate fee on top of stt's price of $175.I didn't know they did track days there. May have to look into that sometime if it doesn't require their outrageous membership fees lol.
Looks like there is a motorcycle track day on my birthday haha