Hi there
A little bit more from the 'oracle'
In some villages within the Yorkshire moors, people who did not wear oak on that day were smothered in powdered chalk, and so it was known as Chalky Back Day. Yorkshire children also expected a day off school on Royal Oak Day, and if they did not get it, they locked the teacher inside! They would then sing: "Royal Oak Day, Twenty ninth o' May, if thoo disn't gi' us a holiday, we'll all run away."
Royal Oak Day can also be known as Oak Apple Day, and in Berkshire and other parts of England it may also be known as Shick-Sack day. One theory for this, is that oak-apples used to also be called 'shick-shacks'.
Oak Apple Day by Raymond Wilson
Charles the Second, so they tell,
Hid in an oak at Boscobel.
Later, the entire nation
Rejoiced to see his Restoration,
And named the 29th of May
(Quite properly) Oak Apple Day!
Chris in 1066