Oh my goodness, that sounds like fun!! Can I come, please?! LOL I think if you ask around to see what real interest you have, and then start calling hotels and conference rooms, etc... and price a place out, then ask around again and see where the interest is at once you place a price on it. I would need a small committee to help me I think. You would need to plan for shoebox projects and stuff to keep everyone with some projects to do. There are some SCS gallerings around and about, you might want to talk to some of the hostesses of those. Here is link to that forum:
Forums at Splitcoaststampers