How to stuff your face with free doughnuts on National Doughnut Day

June 2 is National Doughnut Day, and you know what that means...free doughnuts! National Doughnut Day was established in 1938 by the Chicago Salvation Army to honor women who served doughnuts to soldiers during World War I. The holiday is traditionally celebrated on the first Friday of June. SEE ALSO: These weed-infused doughnuts taste like pot but won't get you stoned Lucky for us, our doughnut retailer friends are dishing out free treats in honor of everyone's favorite day. Here's where you ca