National Sub Day 2025. National eat a hoagie day takes place on september 14 every year and we’ve got the best tips to help you celebrate. Find out the dates, history and traditions of national sandwich day.

National submarine day is on april 11 and it celebrates the purchase of the uss holland, the first modern commissioned submarine. Substitute teacher day, celebrated on november 21st, 2025, honors the indispensable role of substitute teachers in our education system.