Airsoft further center
There is a country in center Europe which has already been many years organizing an event, worthy successor to the mythical Berget played in Sweden.
We're talking about if someone hasn't guessed yet its the Border War organized in the Czech Republic. An event in which many people as few events able to participate.
Here's the trailer for the seventh edition, the "Operation Skylance" which been uploaded to Youtube GsPAirsoft.