From the 7-11 website:
Happy 7-Eleven Day!
Our Birthday, Your Bash Stop by for a FREE 7.11 oz Slurpee drink, general merriment and a one-man dance party should you choose to start it. (“Running Man” and “Raising the Roof” welcome. “Macarena” NOT welcome. Ever.)
When: Thursday, July 11 11:00 AM until 7:00 PM