Semi-Relevant Irreverence
A little semi-relevant inspiration from today's LA Times, this article "(Water) Gun-Toting Assassins" It's Just Some Urban Fun- points also to this website.
FY further I, see their rules for Capture the Flag. Not that you should necessarily abandon the "Big Games" concept, but rather to help you get an idea of how such an event is organized. Most fortuitous. Most relevant. And not exceptionally reverent.