The chain announced on May 1 that it’s celebrating National Burger Month by offering a free Shake Shack single burger with a $10 minimum purchase every single day in May, plus June 1 for good measure.
National Burger Month is upon us and with it, four weeks' worth of deals from Shake Shack. May 28 is officially National Burger Day, but the entire month of May is also dubbed a time to celebrate the ...
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