Swing by 7-Eleven for a free Slurpee on Thursday and beat the heat! July 11 marks the convenience store chain's 97th birthday, celebrated as National Slurpee Day, when 7-Eleven offers free Slurpees. To grab your free treat, visit a participating 7-Eleven, Speedway, or Stripes store and enjoy a complimentary small Slurpee.