I'm in total agreement with both Steven and Joe.
Even though I've never met either gentlemen, I've had the pleasure of dealing with both when it comes to Airguns, along with Joe regarding Rimfires. I don't care who you are, or where your Club is, you just ain't gonna top what Joe has to offer!
Now, if someone wanted to set up a large Regional or International event (call it what you will) somewhere on the east coast, that would be great and I'm sure if the timing were right, would draw quite a nice crowd of shooters - and there are several facilities that could handle such an event.
I've never beend to Riversbend, and it may be the answer, but some of the ones that immediately come to mind are:
The Charlseton, SC range where the 2011 Worlds were held, I think the name of it was Palmetto. It's a 40 bench range localed not far from the outer edge of Charleston, meaning there are plenty of hotels and restaurants in the area, plus has already been proven to be able to handle a large Airgun event.
Kay C. Young's Black Creek facility just outside of Richmond, VA in Mechanicsville. There you would have tons of hotels and restaurants, along with an International Airport, all within 10 miles of the range, plus RV hookups at the range. Black Creek is a 60 bench range with tons of parking. And even though Black Creek isn't situated in the middle the country, it sure is smack dab along the middle of the east coast, meaning it's within a 9 hour drive from lots of shooters homes. The only drawback may be that the last I knew it didn't have a 25M target line, and I don't know how open they'd be to installing one. But my last trip down was in 2002, so that might have changed. Believe me, if I didn't live 9 hours away, I'd be willing to take the reins on putting something there as Kay C. has always been very open minded and great to deal with.
Then there's Kettlefoot in the very western tip of Virginia where the IR folks hold their Nationals. Again, I don't know if they have a 25M target line, but it's a proven range for handling large events.
And, of course, everybody knows the optimum range as for being centralized while also being capable of handling any sized event is St. Louis, but nobody has seemed to want to step up about trying to coordinate anything there.
I know, as I'm sure most of you do, that there are many more excellent ranges out there. But, as always, the problem is to get somebody who's fairly local to those ranges to step up.
Just my opinion. But if you want it to happen, don't just sit back and wait for it. Make it happen!
Dave Shattuck