It seems like there’s a national holiday for everything. For example, this Sunday is May 15, which happens to be National Slider Day.

National Slider Day might seem like a random day to celebrate, unless of course you are a fast food chain known for your mini burgers…AKA White Castle.

And indeed, White Castle will be celebrating on May 15, and you could benefit from said celebration. Just stop by a location this Sunday, and they will give you a free Cheese Slider. All you have to do is grab the digital coupon on social media and show it when you arrive.

That’s it. Not other purchase necessary according to the press release. But, you’ll probably want to pick up a few more sliders if you’re looking for a full meal.