To celebrate National Ice Cream Day on July 21st, Dairy Queen is giving away free Dilly Bars to those who use the Dairy Queen App. On Saturday the 21st, customers can claim their free treat by becoming DQ Rewards members and making a qualifying purchase. The Dilly Bar, made with DQ vanilla soft serve and chocolate coating, is just one of the many treats available, including a trio of new Blizzard flavors introduced for the summer.