I have two possible locations that will work, both just east of Columbus - centrally located in the state. One is a huge farm but I have to firm out some details with the land owner about it before saying yay or nay....mainly working out what's behind his property as the backstop is a rolling hill so overshoots are not likely but possible (think Bulletfest if you've been).
The other site is my range, which is a more structured range but I'm limited to how many folks I can host, so for that I'd probably be maxed out at 25-30 people. The range is actually quite large, but the firing line is not really wide to support a whole giant gang of people setting up spots. I've hosted 40 people before (kind of pushing it), but you have to "step up to" the firing line, not camp out on it. The good thing about my range is, it's 3-D so there we could run action shoots or have an informal match quite easily if folks are into that.
Depending on those two variables, I may be able to play host to an event. Not promising anything, but I'm working on it.