Look just divide the distance between the two farthest from each other and that would be the spot to meet up at. It is not going to be equal to every one but it is a central place for every one. If some don't or can not make it, than maybe they could make it next year!!!
The thing is, it is a central place and if they want to come than they will.
As for me, if nothing happens, I'll be there, but we need to set a place by the 1st. of next week, so members and who ever comes can do there planning to be there. I can not just jump in my car and go for a long ride, as much as I would love to do that, I still need to clear my schedule in advance but not on the spur of the moment.
I am going broke with all this 2 cents worth, I am up to 8 cents now. Shortly I will have no "sense" left to contribute !!!!