The only problem with being there over Labor Day will be finding a spot to stay. Unless you already have reservations at a motel or cabin,you won't find any available know. The other thing you'll run into is that none of the resorts will take a reservation for a campsite or RV spot,its all first come first served at Sekiu. The resorts will tell you they'll have room but it sucks to get there and find out you'll be camping in a parking lot on gravel.