Historically there has been a gathering on the Mississippi in the Alton Ill area. The last gathering was in Lake Barkley/Lake Kentucky. The main person sponsoring these, unfortunately has passed on, and no one has stepped up to the plate to do these.
I am too old to travel to them any more. Tex of Bixby Club had also been involved. I am sure you would get good attendance if you were to organize and hold one of these. There is not much involved. Reserve slips in a marina, put out the notices, and organize one to two presentations, maybe some local entertainment. I know that the Marina at DUBUQUE, IOWA, where the National Museum of the Mississippi and Aquarium are located would love to have another C Dory gathering, as well as the other marina in Dubuque, and the Marina at Alton, Ill has done a good job in hosting the C brats in prior years. There are good restaurants close by all of these, plus the historic Mississippi River to cruise. The Mark Twain country!
We have cruised most of the Great Rivers in the Eastern US, and these gatherings are great points to start or end a cruise on the Mississippi, Cumberland, Kentucky, Ohio, and Tennessee Rivers.