Usually, Nerf wars are scheduled at least a month ahead of time, this allows people to free up their schedules, make darts and bring whatever they're brining in working condition. Just my two cents.
We all forget that although most of us follow similar ways to nerf, we're free to interpret the hobby responsibly as we want to. And besides, this isn't as complicated as something like a stampede and might open up some new ideas to the community, I mean c'mon we created SILENCERS, crappy silencers, but silencers.