I recommend Virginia(that's right in the middle)
. Would love to see this happen but with my schedule I'm unlikely to be able to attend unless its a single day event(Sunday) and within a few hours drive of central VA. For future possibility there is a fairly new but growing weekend long tournament called the NOVA Open:http://www.novaopen.com/
Based on this boards activity a lot of the east coast players seem to be in Central Va and the Baltimore/DC area. NOVA would be perfect for this. Happening a little too soon to arrange something this year but its a good possibility for next year. In the meantime I'm trying to work out another demo/open play day in the next 2-3 weeks for players here in VA.