White Castle's Slider Day is Friday, May 15, and the 105-year-old brand is offering them for free, no purchase necessary. Customers can get one free, original 2-inch-by-2-inch hamburger by using the ...
National Slider Day is celebrated annually on May 15. White Castle, headquartered in Columbus, is credited with inventing the slider and the concept of fast food. Restaurants in and around Columbus ...
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