"Wireless Battle of the Mesh" is being held from 26 March-1 April in Athens: http://battlemesh.org/BattleMeshV5
Part of the event is a "Warm Up" at Sarantaporo village - ~200Km north of Athens, with currently 9 wifi mesh networks in the surrounding area.
They have some nice links graphing their meshes:
Sarantaporo: http://www.sarantaporo.gr/node/98
Milea: http://www.sarantaporo.gr/node/141
Farmaki: http://www.sarantaporo.gr/node/211
Tsapournia: http://www.sarantaporo.gr/node/168
Dolihi: http://www.sarantaporo.gr/node/142
Kalivia: http://www.sarantaporo.gr/node/143
Pythio: http://www.sarantaporo.gr/node/144
Kokkinogi: http://www.sarantaporo.gr/node/161
Lofos: http://www.sarantaporo.gr/node/175
