And, also...
People speak different languages. And, each country has its own culture and
subcultures. As well as, its own political and social reality.
So, to attended an event abroad, would, not only force oneself to deal with a
different culture that one may not be familiar with (which is not a hard
thing to do, but something that makes one more reluctant to travel), and also
force oneself to "immerse" in a reality that is not one's own, only to
shortly after having to "emerge" from that, but, it would also "force"
(maybe, and out of politeness) the local people to not talk in their native
language, during that event, so that foreigners could also socialize with the
group. (Which doesn't sound like a very nice situation to create...)
Summarizing...
There are also language, social and cultural differences - and consequential
barriers - within Europe. So, it doesn't make that much sense - at least, to
me - to attend an event like this abroad.
