Lake of the Woods has several options for staying for the Lake of the Woods Tri/Sport Weekend.
There is tent camping at both Aspen and Sunset campgrounds which are both very close to the start of the event.  Reservation page for Aspen and Reservation page for Sunset

Get cozy in a cabin check here or call
866-201-4194 Lake of the Woods.
RV spots are also available. Take a look at the map here.