Well, I don't know if this is really new, but today I tried to squeeze in a birthday before the school bus came. I kind of figured the game wouldn't allow me to send the birthday boy, who turned from child to teen, to school, but I was counting on sending his older sister and three younger siblings. I even got the school bus pop-up, but when the time came, no bus arrived. All five kids stayed home. Then the two teens, both of whom had jobs, the older one for many days, skipped work. No carpool ever showed up and it wouldn't allow me to send them. None of them took any hit for missed work or school and two of them even did homework autonomously that I'm nearly certain they'd finished the night before, as if they'd gotten more sent home from their teachers! I posted in the Help forum, but on Monday (this took place on a Friday) all the kids went to their respective schools and jobs without a fuss. I guess the game figured something important was going on, so let's cancel formal activities? The older teen, who already had her job, even got paid for a day off. That will be the last birthday I try to squeeze in at the bus stop!
I read about holidays where things are cancelled with Seasons, but I don't have Supernatural or Seasons yet, though I am patched up.