Doughnuts, or donuts, often defined as sweet fried dough, have been found in societies all over the world throughout history. Creme filled doughnuts are a little bit more modern. The most famous variety of cream filled doughnut was the Boston Creme doughnut, with chocolate topping and custard filling based on the Boston creme pie. Cream Filled Doughnut Day celebrates these delicious doughnuts in all their varieties. You can celebrate this holiday by visiting any doughnut shop and buying a dozen cream filled ones for yourself and your loved ones.