WINSTON-SALEM, N.C. - Krispy Kreme is celebrating its 83rd birthday by giving away free doughnuts.On July 17, customers can get a free box of a dozen glazed doughnuts with the purchase of any dozen, including treats such as the chocolate iced glazed, cake batter or glazed blueberry cake.In addition to the doughnuts, Krispy Kreme said it is also extending its “Hot Light” hours.