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Free Slider Alert: Celebrate National Slider Day at White Castle!
5/13/2025
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- Get ready to indulge on May 15 as White Castle celebrates National Slider Day! Since 2015, this delicious tradition has honored the beloved original slider, first introduced in 1921. Enjoy a free slider by using the code "SLIDERDAY" on the app or snagging a coupon from their website. Don’t miss out on this tasty treat!
