When I was a kid, which was a while ago, in elementary school we’d make a “mailbox”, usually just colored paper folded over and decorated, and then everyone in class would drop a little Valentine’s Day card in everyone’s mailbox. A wonderful opportunity for petty, social power plays (as in 20 classmates but only 17 cards.) I guess it’s gone big.
I have a teacher friend who says in her school they aren’t allowed to use the word Valentines Day, but the administration decided the teachers would give Valentine’s Day cards to an elderly center. And she was in charge of it. So she dubbed it the mid-winter something or another.