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It’s a holiday celebrated exclusively in convenience stores across the country: Yes, 7-Eleven Day is here again.

In honor of the convenience chain’s 91st anniversary, 7-Eleven stores everywhere are once again offering patrons a free small Slurpee between the hours of 11 a.m. and 7 p.m.

The Irving, Tex. based chain confirmed in a press release that participating locations expect to distribute 9 million Slurpees through the one-day promotion that is “inviting millions to the party.”

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“Free Slurpee day may be the most anticipated day of the year for millions of 7‑Eleven customers and new customers alike,” said Raj Kapoor, 7‑Eleven senior vice president, in the release.

“7‑Eleven Day is a celebration, not only of our birthday, but more importantly, of our customers.”

The fun doesn’t end there for fans who have enrolled in the 7Rewardsprogram through the 7-Eleven app, either; the chain is set to follow up free Slurpee day with a week of giveaways dubbed “seven deals in seven days.” Promotions include:

July 12: Free 7-Select Pure Water with the purchase of any Bodyarmor sports drink.
July 13: Free Big Gulp with the purchase of a share-size Snickers.
July 14: Free popcorn with the purchase of a 20-ounce Smartwater. 
July 15: Free Reese's with the purchase of a share-size bag of 7-Select gummies. 
July 16: Free 20-ounce Coke with the purchase of any package of Cheez-Its.

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Nevertheless, the holiday arrives with some strict ground rules.

After the “Bring Your Own Cup” holiday, traditionally celebrated in May, started to draw Slurpee fans with 5-gallon buckets and empty fish tanks, 7-Eleven stipulated that “cups” have to be able to fit upright between the 10-inch space under the Slurpee nozzle, Fox 2 Detroit reports.

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