Game, Set, Sip: Free Dunkin’ Pop-Up August 30-31 Celebrate tennis season with @Dunkin + @americanexpress Gold in Grand Central Terminal! Get a free drink + munchkins in a tennis can, and step on the court for a tennis challenge for a free tumbler (+ gift card if you win!) + card members can skip the line. Share with a friend who loves Dunkin’ and tennis! 📍 Grand Central Terminal @grandcentralnyc 🗓️ August 30 - 31 ⏰ 9:30 AM - 5:30 PM #nycforfree #dunkin