Buying Guild Hall, have a few questions please

Our guild is buying a guild hall this weekend. We have members in Europe and US. If we buy the guild hall on the US server, will our European guild members be able to travel to the guild hall and participate in GvG? If not, is there any way for people on different region servers to particpate in one guild short of meeting up in international district? Evidently you can't purchase a guild hall from the international server since there is no NPC to talk to at the docks in Lion's Arch to get you to the islands.

Any help appreciated.Thanks.

Guild Hall dont have districts sry if that doesnt clarify anyting i have brit in my guild and he got to to our GH with out doing antyhgin special