India, Sept. 19 -- Restaurant chains across the United States are marking National Cheeseburger Day on Friday, offering free items, buy-one-get-one deals and steep discounts to mark the annual food holiday. McDonald's, Burger King, Wendy's, Shake Shack, Buffalo Wild Wings and dozens of other chains have rolled out promotions to celebrate 18 September, most of which are accessible through restaurant loyalty programmes and mobile apps.

Members of the MyMcDonald's Rewards programme can claim a free Double Cheeseburger on Friday with a minimum $1 purchase through the McDonald's app. "Since burgers are kind of our thing, we'd love for fans to come in and grab their favourite McDonald's drink, snack or meal and add a Double Cheeseburger to cel...