National Cheeseburger Day is September 18th, 2021. Time to ditch your diet and scarf down some comfort food at a discounted price, or even free in some cases. 2021 National Cheeseburger Day Deals Applebee’s– Sit down and celebrate National Cheeseburger Day at Applebee’s. The restaurant is known for its juicy handcrafted burgers, and customers 21 and […]