A tip from this company tells me about their plans to create the world’s first massively multiplayer LBG (location-based gaming) event. The event is scheduled to take place in Marseille, France this fall.
Sketchy details so far, however, we're told that a Big number of games will be available on different spots in the city (Festival in 2-3 days).
More details will be released next month at the GSMA conference (aka. 3GSM)