Moldy Cheese Day is celebrated on October 09. 2018. While it sounds funny, mold is an essential part of some popular cheeses like Gorgonzola, Stilton, Roquefort as well as Brie and Camembert. There are different kind of mold in chees. However, the green and blue mold cheeses are the premium class of moldy cheese. You can celebrate Moldy Cheese Day by enjoying some delicious blue cheese or, if you are not a fan of cheese, search your refrigerator for old cheese which is not supposed to have mold on it.