[rheavn]

Michigan is good for summer time, but booking a rally may be difficult in the summer at the nicer resorts. Texas is good in spring & fall.

Here is another nice place that would be a great place to hold a rally. Beautiful facility. Great weather May & June and September/October. Hot in the summer, but you're right on the Table Rock Lake. Matt, Ron Skeen, Forest & Cindy and myself have stayed at this park.
http://www.ozarksrvresortontablerocklake.com/