Great suggestions so far.

One thing I see missing is shelter. Even with the genetosity of spirit that abounds in NY, Id be concerned with getting stuck outside for a while because of "X" (fire, bomb scare, etc.) within your local AO. It's Spring, so cold and wet weather is part of the seasonal forecast. I'd add a disposable poncho or something equivalant. Personally, i'd also throw in a winter hat, mitts/gloves and a pair of socks, unless you know you're going to be dressed for the worst weather. (I find that harder in Spring and Fall because the temp variances are much wider.)