A fall GP series would be great for riders. There is some tapering off of MOTO once the Labor day weekend passes, it starts getting dark noticeably quicker, and the kids are back in school full time. A GP series where you can come and race for a 2 hour window makes a lot of sense in that time of year to get a lot of riding packed into a short amount of time during the busy time of year for many people. Kids school sports are going on, school itself, and other items. Of course possibly running the mini's / vets near each other in hours would help promote dads / kids all coming down with kids riding first while dad watches, and then dads riding while kids relax from their ride....... and the family gets to hit the road to get back home for homework and decent bed time on school night.
That sounds like a great plan to me.