Today is July 11th – or 7/11. And in honor of this hot, summer day, convenience store chain 7-Eleven is giving everyone a free Slurpee (as long as supplies last, of course).

Free Slurpee Day is just about to begin – kicking off at 11 am and running until 7 pm. If you visit a 7-Eleven store in that time frame, you’re entitled to one free small Slurpee. It’s that easy. No coupons necessary, no questions asked.

Today, 7-Eleven expects to give away 7 million Slurpees or so, which is up a few million from the past couple of years. Free Slurpee Day has become an unofficial national holiday.

7-Eleven is attempting to spread some viral cheer with a new “Dance Party” promotion tied to this year’s Free Slurpee Day. They’re asking customers (who’ve just scored their free Slurpees, I guess), to create their own dance videos and post them on YouTube, Vine, Instagram, or whatever. They’re also asking that Slurpee dancers share the videos across other social networks and make sure to tag @Slurpee and hashtag #slurpeedance.

For 7-Eleven, it’s not just about spreading good cheer. Free Slurpee Day has been known to boost sales. Sure, you could go hopping from 7-Eleven to 7-Eleven, scoring free small Slurpees all day – but apparently, people simply like to buy more Slurpees after they get a taste of one.

Plus, a Slurpee goes down better with a bag of chips, some beef jerky, or another high-sugar treat, right? In the past, Slurpee sales have been known to increase as much as 40% on Free Slurpee Day.