Honestly, as a community event organizer from the days of GW1 (Vegas from Blade Radio), the decision to release the feature without including international capabilities is -very- disappointing. I helped organize absolutely MASSIVE events that would not have been possible without international cooperation.
I can only hope that this is a temporary disappointment and it is your intent to find a way to make international guesting a reality. There are far too many international GW communities for there to be any other acceptable options.
Safe Journeys,,
Vegas