I'm OK either way as I'm in he middle of the continent but it may be an idea to head in a westerly direction.
Some things that come to mind are:
1. good riding area and roads
2. Good weather
3. Infrastructure, large enough hotel or motel accommodations with a campground close enough so the campers can join in. We have both camped and taken rooms for internationals. It is hard to leave the rally site and ride back to your bed each night. Whether we camp or get a room usually depends on this.
The Hub is the only place that offers both camping and rooms at one site and that was fantastic but I seem to remember that it was a bit hot...
Does anyone know of any other sites like this in North America?
4. And a fantastic group of people to organize like this year.
Just me 2 cents.