Every Slurpee superfan knows that July 11 is 7-Eleven Day, an annual event celebrated with a free Slurpee giveaway.

This year, in honor of the frozen drink’s 50th birthday, 7-Eleven is offering a chance to earn extra freebies.

advertisement | advertise on newsday

In addition to giving away free small Slurpees from 11 a.m. to 7 p.m. on July 11, customers who purchase seven Slurpees between July 12 and July 18 will receive 11 coupons for more free Slurpees. In order to get the coupons, customers will have to track their purchases by scanning the 7-Eleven mobile app each time.

The chain is also introducing a new Slurpee, Birthday Cake, to mark the occasion. It’s a combination of traditional birthday cake and vanilla ice cream flavors.