This really is unprecedented:
It's a shame, but there really is no other choice.
Here's an interesting question: now that the convention is cancelled, will school districts try to have school on November 8 and 9? I don't even know if it's possible, but I'll bet many teachers and parents would rather have the kids in school those days than add more days to the school calendar at the end of the year.
I'll look into this some more...
UPDATE: Here's the law about the convention:
18A:31-2. Attendance at conventions of New Jersey Education AssociationThat's fine... but what if there isn't a convention? If it's canceled, can a district open up on the days it was supposed to occur?
Whenever any full-time teaching staff member of any board of education of any local school district or regional school district or of a county vocational school or any secretary, or office clerk applies to the board of education by which he is employed for permission to attend the annual convention of the New Jersey Education Association, such permission shall be granted for a period of not more than two days in any one year and he shall receive his whole salary for the days of actual attendance upon the sessions of such convention upon filing with the secretary of the board a certificate of such attendance signed by the executive secretary of the association.
I have no doubt some districts are going to ask to open on these days. Let's see what happens. Watch for whether Christie decides to make this a state-wide proclamation or not.