I'm almost positive Vermont, Maine, Connecticut and Rhode Island are involved also.
By George, you may be on to something!
I checked the school calendars for Boston, Springfield, Lowell, Worcester, Cambridge, Bridgeport and New Haven CT, and they're all off the week of the 18th. I think it's a little odd that a large chunk of an entire region's public school system is off this late in April, but it is what it is. And the combined population of those states is just under 9.9 million, with NYC's population around 8.1 million. Barring any other explanation (like grad night), I'd go with Disney Fool's explanation, as it also explains the park hours for the next week, and I'm all for unified theories ;-).
Disney Fool, send me your address and I'll send you an '05 Unofficial Guide. Bravo.
I've not checked out the public school calendars for the largest systems in ME and NH. (VT's entire population is around 600,000, and I think more people than that are lost in the subways and taxis of NYC.) If someone would like to provide the spring break schedules for those, I'd greatly appreciate it.
I think this is an interesting example of many small schools exerting influence by coordinating their schedules - I haven't seen the same coordination in any other state east of the Mississippi, for example. I mean, none of those school systems is in the top 100 in the US, but collectively they wield influence.
Len