the flite test assistance is the easy part and kinda like icing on a cake.
Hard part is finding a site NOT waay out in the boonies that people currently use then getting permission from whoever has control allowing such an event. Back in the day everyone was asking for proof of multi million dollar insurance policy in their name or on their behalf before they would even allow considerstion to permit the events. Back then just that binder was a months gross salary for me. The actual policy was a bit more expensive. Flite test will want insurance also. The people that control the land probably want a million dollar liability package on whoever shows up to fly, but that isn't your cost. Is your concern.
If you find a place that allowed such things, got permission in writing, have an insurance binder for coverage, you could now think about having the event and publishing dates and locations. Still looking at a couple-six months prior to the event so people can make plans and reservations. Hopefully it's a decent sized town with a dozen or so hotels and food places. Starting now, midway in Fall is a good date unless your weather goes bad then.
Not saying don't do it, just providing illustrations of how not easey peasey it turns out to be. If you do this, pull it off, even if it didn't work out, I would still be significantly impressed at the work you did.