QotD: Make Up Your Own Holiday Day

Yesterday was National "Make Up Your Own Holiday" Day. If you could create any holiday, what would it be?

The day after my birthday should be a holiday - a sort of birthday Boxing Day if you like (although only the Brits will understand the concept of the Boxing Day). Why not have your birthday as a holiday I hear you ask? Well, it can actually be fun going to work on the day because there is cake and cards and pressies and a general feeling of celebration and people being nice which I'd miss out on if it was a holiday, plus if it the next day is the day after it means you can really enjoy yourself on the day and have an extra day to recover/enjoy.