FREE Donut with ANY Beverage Purchase at Dunkin’ on June 5th Posted On June 4, 2020 On National Donut Day Dunkin’ is offering guests a FREE Classic Donut of their choice with the purchase of any beverage. Classic donut favorites include Boston Kreme, Glazed, Glazed Chocolate, Jelly Filled and more. Dunkin’s special offer to ring in the holiday is good all day on National Donut Day, Friday, June 5, at participating locations while supplies last.*