Virtually all children in this country arrive at school by bike. So do their teachers, and the parents. Wonderful cycle paths make this possible as you can see in this video of a new housing estate in Assen.
This is not "bike to school day" or any other kind of special event. It is what happens on every single day of the year. When this video was taken, the outside temperature was -2 C ( 28 F ).
This is a primary school. Secondary schools are spread much further apart and children cycle up to 20 km each way to get to them.