I agree. I'm learning more about holidays around the world and their dates here than in my time in high school.
Even if almost all the holidays are based on Japanese number-wordplay (goroawase) and/or Japanese history. It's still fun.
Updated
4/26 is Good Bath Day!
Shizuka-chan apparently takes baths at least three times a day. How often do you all take baths?
Based on a word play of よい風呂 (yoi furo) where yo = 4, fu = 2, and ro =6.From Doraemon's Secret Encyclopedia, published 1998.Pervert!You knew I was taking a bath and came in anyway, didn't you?!