It's celebrated almost universally, billions of cards are sent for it, its been happening for thousands of years, and you're assigned a daemon on that day, I'm talking about the day of all days, your birthday.
Find out why birthdays in the west are celebrated with cake and candles, and why the sky on your day of birth was so important. Also, birthday demon, come on... need I say more?
Here’s Why You Should Thank the Ancient Greeks for Your Birthday Cake
The lore of Birthays refrence page
Good Question: How Did Birthday Traditions Start?
The Lore of Birthdays by Ralph Linton, Adelin Linton