They won't shut for the day, but Headteachers are being encouraged to let pupils watch the ceremony on TV.
Flags will also fly at half mast until midnight on the day.
The Royal Family and the government have said public and sporting events will still go ahead.
But they want people taking part in matches, for example, to wear black armbands to show respect.
And they think it's right that people have a minute's silence or sing the National Anthem before major events.