Auntie Ruth’s Doughnuts Is Celebrating National Doughnut Day On Friday With A Free Vanilla Glazed Doughnut For Every Visitor. Both Limestone And Johnson City Locations Are Participating. The Johnson City Location Is Open Friday From 8:30 A.M. To 3 P.M. And The Limestone Stand Is Open From 10 A.M. To 4 P.M. National Doughnut Day Is Celebrated On The First Friday Of June Every Year.