I am a neophyte. I have only been to Meets in three countries -- US, Italy, and Israel -- and the Israeli Meet was actually a "mini-meet" (four of us met for lunch).
Of those three, I met the same people only in the US and Italy.
Hopefully, I will be able to increase that total in the next year with either the Munich Meet or the Dusseldorf Jazz Meet and the Tel Aviv Meet which is now being discussed.