From Boston.com:
"For folks unacquainted with the movable feasts of the culinary calendar, National Doughnut Day falls on June 5 this year, and on that blessed day, Dunkin' Donuts, the Canton-based coffee-and-baked-goods chain, said that participating stores nationwide "will give every customer a free donut of their choice, with the purchase of any beverage, limit one per customer." "
Yum....