There is this game called assassins. Basically you need a group of people to play it. What happens is that people go around looking for a target and to advance to the next stage you have to hit them with a water gun or some equivalent. Whoever hits their target without getting hit themselves advances to the next stage, etc. There are safe zones and such (like get togethers) from preventing this from being too easy.
What if we did something like this on the fansite? Obviously we can't use water guns, maybe whoever says a codeword near the person gets a kill? We could simplify it a bit (maybe whoever gets the most kills wins instead of having a bunch of rounds) and set up a few safe zones (the GE and group events comes to mind).