So the JWs will already know how to get to their designated meeting area after armegeddon.
They realized that controling groups of 10,000 will be much more difficult so they have to move to larger venues.
Make sure you know where it is because after armegeddon they will filter out the weak people that slipped through the cracks by saying "meet at last years convfention center". If you don't know where it is then you will be SOL when it comes to the spirtual food they will be passing out.
Or it could be money
On a side note why isn't the US listed in this site
http://www.jw.org/apps/E_FRNsPnPBrt
Kind of curious if they are doing the same thing in my neck of the woods.