UPDATE, as I had not heard form anyone on venues to stay at. I researched this a bit more myself. I have managed to find a State Park at the Temperance River that has 14 sites available for Friday September 7th through Sunday September 9th. 7 sites are on the lower area, and 7 are on the upper area. There is a bridge over the river connecting the sites together. Some have electrical hookups and water. Most sites are within a few hundred feet of the lake. The cost for a hookup site is $22 plus $8 reservation fee. Non hookup sites are available for $18 plus $8 reservation fee. See this link for map details. http://www.superiortrails.com/temperance.html

This campground is roughly 80 miles north of Duluth, but is more central than Two Harbors allowing more flexibility to go further north towards Grand Marais, or south to Gooseberry, Tettegouche, Split Rock etc. Temperance River State Park phone number is (218) 663-7476 and the reservation line is at 1 (866) 857-2757

One other option is Lambs Resort. They are also in the town of Schroeder and have availability for 14 x water and electrical sites at $26.95 plus tax.
and they have a bunch of tent sites without hookups for $23.60 plus tax. I have gone ahead and already booked a site at this campground as their sites are closer to the water (20 yards) than the state park. They can be reached at 218 663 7292. Here is their internet site URL:- http://lambsresort.com/ I have explained that there maybe more folks from our group registering. For reference, I am in Campsite E. Get your reservations in ASAP if you are committed to going and let me know when your reservation is set so I can get a list together. Sounds like this is really happening now, let's follow through and make for a great trip. Thanks!!