I had given some thought to starting the Meet in the Middle gathering back up, but rather than on the Mississippi, moving it to one of the Lakes you are looking at. (Kentucky Lake or Lake Barkley.) I decided I really didn't want the responsibility to host a gathering, and like my flexibility to change plans at the last minute. That being said, I think that area would make for a wonderful gathering location. There are numerous marinas and state parks in the area, and both the Tennessee and Cumberland Rivers offer some great cruising for before or after any gathering. I believe if you posted dates early enough, you could get a decent turn out of up to 20 boats. (Considering past gatherings on the Meet in the Middle on the Mississippi River.) l have in the past been able to park my truck and trailer (with no problems) at the Kentucky Lake Dam State Park, for several weeks at a time. But not without some hesitation. Officially, long term (or even overnight) parking is not allowed. However in direct communication with the park ranger, was told it would be ok. Getting a hold of the park ranger is somewhat difficult, and doubtful authorization would be given for a large group to park. There is one marina on the Barkley side I believe, that is also a KOA, and would welcome us. But dicey getting in to their marina during low water levels. (Have to follow charts closely). (The lake is drawn down to winter pool starting in late September. But should be back up with the Spring rains/floods) But there are still many other marinas that may be available. I don't have my information any more, but one or two marinas said overnighting on one's boat would not be allowed.... In the past, the Meet in the Middle was held the first weekend after Labor Day. This is probably a good time to continue, as boating activity has died down some, but most the marinas are still open, and water levels still good. Early October offers some great fall colors.
Land Between the Lakes has one area, Patti's Settlement, that offers some interesting shops and good restaurants. Lighthouse marina is right there, but my experience is they don't have a lot of slips available during the height of boating season. There are nice areas to just anchor out as well, and perhaps finding a anchorage with good beach access would work well also. In summary, both Barkley and Kentucky Lakes would offer a great place for a gathering. Another Lake I'd recommend would be Lake Cumberland. There are two marinas side by side, the Lake Cumberland State Dock, and then the Jamestown Safe Harbor Marina. I prefer Jamestown, as there is ample parking that is also very secure. The Lake is big enough to also allow some slow cruising around it's expansive shoreline, or plenty of other water activities.
And yes, if the timing worked out within my schedule, I'd be very interested in attending a gathering on any of these lakes. Colby