In case you forgot to mark your calendar, it's National Cheese Pizza Day! As if you needed a special day to celebrate cheese pizza. This holiday dates back to some time when people started delegating made up national holidays for each calendar day. And oddly it doesn't fall in October during National Pizza Month. The important thing is to just get out there and eat some delicious cheese pizza, whether it's a Sicilian, deep dish, grandma, or a good old New York slice.