In the end, the Flat Earth Society will need only one convention.
That said, its easier to have a few.
I'll start a kickstarter for a flat earth society conference in the Knoxville Convention Center or a local venue appropriate to this. If we get enough cash, we can start organizing our speakers and events etc.
If anyone is truly interested in coordinating this endeavor I'd appreciate the help as I have zero knowledge on such things and my time here is already pressed.