The name Dunkin’ Donuts was hatched in 1950, two years after founder William Rosenberg had unveiled a coffee and doughnut shop outside of Boston.

National Donut Day at Dunkin' means one free donut for all customers who make a beverage purchase on Friday. It also means fresh merchandise.

Dunkin is also throwing in some new merchandise to sweeten the deal and celebrate the delicious holiday. At select locations, the donut chain will serve your donuts in a mini donut bag, created in ...