Dunkin’ Donuts: While purists may not count frozen lemonade as a smoothie, this refreshing summer drink will be available for free at Dunkin’ Donuts on June 21. On that day (between 10 a.m. to 2 p.m.), participating locations will be holding Frozen Lemonade tasting events and handing out free 3.5-oz. samples of frozen lemonade . Edible Arrangements: You may know Edible Arrangements best for its elaborate fruit bouquets. But it also offers fruit cups and snacks. To celebrate National Smoothie Day, it will offer $0.99 smoothies today, June 21. Smoothie King: On June 21, buy one smoothie and get one free at participating locations only. Text SIP to 91681 to get your coupon or head over to the Killeen location and mention my name at the counter. Wayback Burgers: Do shakes count as smoothies? We think so. Get a free 12-oz. Black & White Milkshake on June 21. One per person, in-store only.