Dunkin’ is giving away free coffee for holiday you’ve never heard of

April 20 is National Cold Brew Day, and here’s how you can get free coffee from Dunkin’ to celebrate.

Cold brew is the ideal drink for coffee lovers who just need that extra hit of caffeine in the morning. As per the name, cold brew is made by grinding coffee beans and brewing them in a vat with cold water for about 18 hours.

Of course, a coffee this innovative deserves its own holiday, and April 20 is the day to celebrate. However, no one actually knows why the holiday falls on this day, and it seems to have been chosen at random.

Dunkin’ are offering customers a free cold brew coffee on the big day. All you need to do is sign up to Dunkin’ Rewards (if you haven’t already) and then on Saturday April 20, you will get a free cold brew alongside any purchase from the menu.

How much is the deal worth?

A large cold brew at Dunkin’ costs $4.59, and that’s before you add any extras. Syrup shots, both sweetened and unsweetened, are free at Dunkin’ anyway, so add as many of those as you’d like. However, non-dairy milks and cold foam will cost you 70 cents, and you can get all of this included in the April 20 deal. This means that you’re getting about $5 worth of free coffee!

The deal is redeemable for all Dunkin’ Rewards members, even if you just sign up for the rewards scheme on the day, and you’ll be eligible as long as you buy any one item from the menu. It’s the perfect excuse for a donut to go with your coffee.

Dunkin’ have run similar deals in the past, including giving away free coffee to teachers, and even Taylor Swift fans. People who use the Dunkin’ app will also get a free drink on their birthday.