Don't know (my friend is an East Coaster and has gone to bed by now).
Just seems to me to be a bit late to line up volunteers (not like the venue wasn't known years in advance...)
Could it be that they've only just realized that they didn't line up enough volunteers? A simple over-sight? If they're scrambling to get more supplies too, that might suggest they're acting on new info, or maybe they just didn't plan well. Do they have a new administrator, who discovered they've all had their heads up their butts? Are any law enforcement agencies issuing last-minute changes?
I suspect the Red Cross is just carrying on their tradition of poor planning. But if there are other indications of RC or others stepping up personnel and supplies at the last minute, there very well may be an additional thread beside the usual vandalism. I hope we get some answers.