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Now through July 31, 2023, Shake Shack is sweetening your afternoons with buy-one-get-one FREE shake special at participating locations when you place your order in the app or online! Choose from a variety of tasty shakes like the Sprinkle Cookie Shake or the Oreo Cookie Funnel Cake Shake. Simply place your order for any size or flavor shake in the app or website and enter Promo Code: SHAKEITUP at checkout for discount to apply! Pick up must be scheduled between 2:00 p.m. – 5:00 p.m.