June 19, 2018 No Comments FREE Frozen Lemonade Sample at Dunkin’ Donuts On Thursday, June 21 guests at participating Dunkin’ Donuts nationwide are invited to enjoy a complimentary sample (3.5-ounce) of Frozen Lemonade from 10 AM to 2 PM, while supplies last. FREE Frozen Lemonade Sample at Dunkin’ Donuts – EXPIRED Facebook Twitter Add Comment Notify me of follow-up comments by email. Notify me of new posts by email.