Unfortunately they have to if they want to make sure parents get it. Every week my school's sends out a weekly email of everything happening in the quarter with emphasis increasing as time get closer. Then there's emails for when parents actually have to do something like sign up. There's physical flyers. There's the private Facebook like app that reiterates when parents have to do something. And the public Google calendar. Parents STILL miss it. And it's not even a few. At this point I just assume I have to tell people in person with my own mouth if I want to make sure they'll do the thing for their kid (and thus make my kid's day better)