You come off as snarky, but I kind of agree. We tried this first.
It turns out digital collaborative calendars are pretty great for us in general, there is no chance in hell I could keep the analog one up to date, so it was definitely worth having a screen on the wall.
This one will not display an invitation that was in an email you forgot to even open.
I hear the ancients had their own crude technology for this:
https://en.m.wikipedia.org/wiki/Calendar_(stationery)