Tropical Smoothie Cafe is kicking off summer with free smoothies. On Wednesday, May 28, anyone wearing flip flops can visit a cafe from 2 p.m. to 7 p.m. and receive a free 12-ounce Sunrise Sunset ...

According to nationaldaycalendar.com, the day was started in 2007 by Tropical Smoothie Cafe to celebrate its 10th anniversary. You can wear your favorite flip-flops and post images to social media ...