I hate being the lone voice, but... We had this at my college, and it absolutely sucked. Bad leadership, no mission, zombies could have shields (they were supposed to be the size of a paper plate, but the refs turned their heads at one guy who had a fricking TOWER shield made out of cardboard), etc. We even had one case where some friends of a zombie who were survivors snuck up on other players and physically restrained them for their friend to tag. Not cool. The leadership just went along with it and said it wasn't against the rules (who would write rules for 'in case a few players are major jerks who go against their own team for lols?' It never says in Football that you can't deliberately score on your own team, after all.) Just so you guys know, make sure that the group leading yours is interested in the game and does missions, rather than just saying 'oh, yeah, run around, final battle in... a week... uh... in the commons.' When they realized the game was boring like that, they implemented the 'strong suggestion' of going outside at night for no reason other than letting the zombies have a good chance of tagging you. Just go and hang out in the middle of the commons and let the zombies have a go at you. You know, to make things fair. In their own words "but if you wanna be a wimp and just hide in your room all night, you'll 'win', but we'll laugh at you".
Likewise, if you're gonna start it up on your campus, make sure you have a plan. Do a small-scale 2 hour event to start, if you have to, but don't do like the group at mine did at make the game a total farce. Plan missions, make rules, and for god's sake ENFORCE THEM! Keep with the spirit of the game and not the letter of the law. If people are playing against their team, ask them to switch teams or quit rather than playing the 'but we like our friend better than our team' game.