Did you know there is a National Cheeseburger Day? That shouldn't be confused with National Hamburger Day. There's one of those, too. National Cheeseburger Day is in September and National Hamburger Day is in May. I'm not sure exactly how National Hamburger/Cheeseburger Day is officially celebrated, but it's probably safe to assume that the day is marked by ordering a favorite burger from a favorite restaurant. Where would you order from?