I once got a refill for my DayTimer and it included a little sticker for all the world's holidays. Of course, I put all the Japanese holiday reminders on the correct pages plus as many as I could (or before I got bored with the task). I made it a point to leave voice mails for several co-workers' with a brisk announcement of the holiday. Happy Boxing Day was the one that got the most reponses! I'm sure they all wish I still worked there!
Ed