Dunkin' Donuts is celebrating National Doughnut Day, June 5 by offering a free doughnut with a drink purchase! I confirmed the location on Western Blvd in Raleigh is participating. You may want to verify with your location.
This offer is valid on Friday, June 5, 2015. See their Facebook page for details.
Thanks to Suzy for posting about the offer on the Smart Shopper Facebook page!