This idea was prompted by a comment Sidney Roundwood left and a post at Gothridge Manor.
It's an alternative, live-action game to play at an event, for when gamers are posting photos of themselves in advance to help in meeting up and plan to take more when they're there to post later, as often happens. It also lets some protect their real-world identity if they want to or need to. I'll call them all posters.
It's simple. Everyone carries a camera and the idea is to take a clear photo of as many other posters as possible; other individuals in shot are considered innocent victims and reduce counts at an agreed ratio. Posters protecting their identity are a special case - they play the sniper end of the spectrum and can have other posters in the frame only.
Queues for entry and planned meet-ups are 'safe havens'. Zoom is allowed as it raises risk of blur, but cropping not. The pics are posted after the event and numbers totalled, and popular opinion decides quality if there's doubt, with all but the sharpest discarded.
It could add a real frisson to the event, more of the tension of actual struggle. It's funny more gaming events don't arrange overarching games, or weave them into the structure, maybe using ambient random or similar methods. With so many gamers in one place...