For those of you within striking distance of the confluence of the Yellowstone and the Missouri River and with a strange bent toward wearing funny old clothes and reenacting times without showers and decent hygiene, this is the place to be.
The National Park Service runs this wonderful historic site that features an historically correct rebuild of the fur trade post on the site. They went back to Karl Bodmer and George Catlin's paintings from the time and place in order to rebuild it as it existed at the time. Every summer they have an encampment that is free of charge to historical re-enactors and free to the public to visit.
There will be numerous demonstrations all weekend long in case you ever wanted to see how to skin a beaver, blacksmith, make pottery, knap stone, or re-create a Plains horsebow. Unlike most Rendezvous, there will be no shooting competitions, tomahawk or knife throwing,etc. This is on a National Historic Site and it's an act of Congress to allow any shooting of any kind. Look at it this way...you can go home and not have to worry about cleaning any guns! Instead, you can hang around, talk moccasin-talk around a fire, eat and drink well, and spend time with like minded people.
I'll be in the large white bell back wedge tent with the rain fly out front. You will know it is me becaue there will be yellow wood shavings!