Tartan Day Scottish American Heritage Month:Celebrated in April. National Tartan Day, held each year on April 6 in the United States, celebrates the historical links between Scotland and North America and the contributions Scottish Americans have made to US history and society. Frequently, Scottish culture is celebrated through festivals known as Highland games. Various events include Whisky tastings, eating Haggis, Caber toss, Hammer throws, and traditional Scottish dances.