National Burger Day Is Friday, 5/28. Make Yours or Get It Free. Tomorrow kicks off Memorial Day weekend with a day set aside for burgers, of all things. Tomorrow (5/28) is National Hamburger Day. To celebrate, and just because I love them, at my house we're having "Charlie's Smash Burgers." Get our free mobile app They're my favorite thing to cook on my griddle. They're quick, simple, and everyone in my family loves them. How I Make My Smash Burgers For my smash burgers, less is more. All you really need is a generous amount of salt and pepper to season the hamburger meat with once it's on the griddle.