Participating 7-Eleven stores in the U.S. and Canada will give away 12-ounce Slurpees from 11 a.m. to 7 p.m.
7-Eleven was born in the summer of 1927 in suburban Dallas. It now operates more than 50,000 stores in 16 countries.
"In addition to selling blocks of ice to refrigerate food, an enterprising ice dock employee began offering milk, bread and eggs on Sundays and evenings when grocery stores were closed. This new business idea produced satisfied customers and increased sales, and convenience retailing was born!" the store's Facebook page says.
The company says until 1946, the stores were called "Tote'm" because customers "toted" their items away. Stores also featured actual totem poles in front. Then the stores made a name change to 7-Eleven.
"It'll be so great, you'll feel like dancing. Especially after you see the Slurpee Dance. Oh yes, there's a dance," the store's official Facebook invite says, referring to the video dance competition held in conjunction with the 7/11 birthday.
Watch the dance video, how-to guide and bonus footage here: http://bit.ly/SlurpeeDance