Perhaps the definition of "zone" could be looked at? It is quite common for several people in this region to attend trials in Wisconsin, Minnesota, Iowa and Illinois. Last year I attended trials that were "re-runs" of previous trials no fewer than four times. It was humorous at first, but it got a bit old after a while.
I am well aware that not everyone remembers courses to the extent that I do. Some people that I know were at trials where we previously ran this set of courses admit to being oblivious to having run them before.
I was not in Wrenshall, but for some of the people attending it was, indeed, their third time seeing that set of courses. Had I attended, I would not have been pleased. I understand it would be quite an undertaking, but I do wish this sort of thing would be tracked to avoid having the same group of exhibitors seeing the same set of courses multiple times.