National Calzone Day is observed in the USA every year on November 1. This informal food holiday celebrates the calzone, a stuffed pizza that originated in Naples during the 18th century. Calzones are made with leavened dough and filled with various ingredients commonly used as pizza toppings, such as cheeses, ham, salami, and vegetables. The holiday was launched in 2016 by Minsky’s Pizza to commemorate the restaurant's 40th anniversary and promote their handmade calzones. Many pizza restaurants across the nation participate by offering discounts and promotions on this day. People celebrate by enjoying calzones, baking their own, or hosting calzone parties with friends and family. The holiday encourages sharing and socializing, often highlighted on social media with the hashtag #NationalCalzoneDay.