Dunkin' celebrates National Cold Brew Day on April 20th by offering a free Cold Brew to Dunkin' Rewards members who make any purchase through the Dunkin’ mobile app. Participants can customize their Cold Brew with free add-ons such as cold foam, flavor shots, and swirls. Those not already members can join Dunkin' Rewards and download the app to participate 

 Celebrate National Cold Brew Day in style with Dunkin'! On April 20th, Dunkin' Rewards members can treat themselves to a FREE Cold Brew Coffee by simply making any purchase through the Dunkin' mobile app.