I think number of events is a bad thing to have in the calculation. I think that a UMP like points is much better for comparing a group that doesn't run together. You take the best finishes of x number of races. Then you assign a point system for sanctioned races and for weekly shows based on car count. Takes out factors like more rain outs in one region and longer seasons. Plus the guy that can't race 3 times a weekend can be involved too.