On May 28, Burger King Royal Perks loyalty program members can get a free hamburger with the purchase of $1 or more. Royal Perks members can also get a hamburger for 125 crowns (half the usual reward redemption cost) through the end of May.

National Hamburger Day is Wednesday, May 28, and many burger spots like Wendy's, Burger King, Shake Shack, Smashburger and Whataburger have specials.

National Hamburger Day is May 28, and restaurants nationwide are offering burger deals, including BOGO offers, discounted combos, and rewards perks. Chains like Burger King, Wendy’s, Shake Shack, and Dairy Queen are participating,