well tellico would be great as far as trails go,but it's not group friendly.With the exeption of Crawford's campground,there's really no place close for a large group to gather.
Wheeling in the country would be great.The trails aren't that long,some just a few hundred yards,but are very challenging,but there's alot of obsticales over a fairly large area and there's plenty of room for a large group.
I'm know there are lot's more places it could be held,but these are the only ones I am familar with. So post up your idea'rs