Chill.
It's usually on Facebook. Several county councils, and schools, have a little video of happy children to remind parents of holiday dates.
They always have the written format on their websites.
In the current day and age, where this generation of parents is used to picking up information from videos etc, it's a good idea.
My DGD's school produces clips, and there's always hundreds of views showing, so people must be using this method of communication.