 7-Eleven's annual July 11th free Slurpee Day coming in the middle of a national heat wave this year. Customers invited to stop by their local 7-Eleven and help themselves to a sweet, icy Slurpee for free. The 97-year-old company has been pouring free frozen drinks each year on July 11th since 2002. But it's hoping to raise awareness this year of an important cause.