National Smoothie Day Tropical Smoothie 2024 Schedule. Tropical smoothie cafe invites guests to kick off summer with a free smoothie on national flip flop day. From smoothie king to jamba, playa bowls and more, here are some sweet deals for celebrating national smoothie day on june 21.

From freebies to major discounts, you. Fans can enjoy their favorite smoothie flavors—mango pineapple, pineapple banana, green machine, and pineapple strawberry—for free starting today, june 20th, until tomorrow, june 21st.