I thought about this idea - that maybe the storyline is about the cleaving between Those Who Know and Those Who Don't, and how those with a little information react (who do you tell - your teenage daughter, your neighbor, when & how to do it and not sound crazy).
I'm not a parent, so I don't know what's involved with a school closure, but it seems like a massive headache for school administrators and parents alike - at a high school probably (at least) half the kids can't drive, so you need to call up parents, round up buses, etc. Some kids walk, etc., but I assume the school has to notify the parents, so there's a bunch of "The school is closed? Why? Wait, what video?" conversations. So it doesn't seem like something that would be (a) undertaken lightly or (b) wouldn't have some community consequences.