Preparing for emergencies

There was a "smoke event" at my kids' school on Friday, which turns out to have been someone throwing a flare down in a crowded hallway, and it getting kicked around where it could burn people and fill the area with smoke. A teacher and a student were injured, and the rest of the student body wound up outside in the freezing cold without jackets -- or, in the case of my son, in his shorts-and-T-shirt gym uniform.

A threat was received for another such attack today, but so far, from my window facing the school, I see no fire-alarm exodus. I can usually hear the chatter and know all 3,000-some students are out there even with my curtains closed. I hope this means they've thwarted the attempt, because although I remembered to send sweats for my son's gym uniform, I forgot to dress him in something sufficiently warm for the rest of the day. If they have to split out during class or lunch instead of gym, he's going to have another cooooooooold spell.