Last year I had quite a sad conversation with a non religious friend of mine. He was really quite upset, over the fact that his 3 year girl had come home from Kindergarten with a picture to colour in. The picture had the title of "Yom Kippur" and a picture of a girl on a bicycle.
In Israel for the "serious" non religious Yom Kippur is the festival of the bicycle. It is the one day of the year when kids can bike around the city without worrying about traffic. This has become very widespread - so much so that even in the 99% religious neighborhood I live in Jerusalem, I saw many many kids on Bicycles this week.