St. Cecil Day is for that special someone who has the ego of a planet or solar system, whether it is a friend, an acquintance, a stranger or your boss. Or you could do the entirety of humanity. This excessive pride was known to the Ancient Greeks as hubris and there's several mythologies relating to it. Read one such myth and eat some cake. You deserve it.
Also a day to celebrate good spelling and punctuation. That's what caused the Roman Empire to fall you know.