I use to help organize 3-day pre-1840 blackpowder rendezvous shoots for two blackpowder clubs, both of which I belonged, these were local, annual events that took months of planning and help from every member of the club, one had about 50 members, the other closer to 100. Even these local events took many, many man-hours(and woman-hours
) to make the events sucessful, and they were both held on dedicated property that was owned by the clubs for their monthy events. Trying to do a similar thing on property that isn't available 24/7 and dedicated for an event is an entirely different matter and one that would take considerable investment of time, money and long range planning to be sucessful.
Like I said before, you'd be better off finding such a place that's capable of handling the anticipated turn out, regardless of where it's at, then find folks that are interested in attending and being part of making it happen, particularly those locals that would be the core group of organizers, just like Wes, Dano and the PD shoot fellas do.
Tim