Friday is apparently the 8th annual “National Flip Flop Day,” and the Tropical Smoothie Cafe store in Virginia Square will be giving out free smoothies to mark the occasion.

From 2:00 to 7:00 p.m., the store at 3811 N. Fairfax Drive will be giving away free 24 ounce strawberry banana smoothies to anyone wearing flip flops, according to owner Marcus Barnett.

“This is a nationwide event that all Tropical Smoothies will be participating in and is absolutely free to anyone that comes in wearing flip flops,” Barnett told ARLnow.com. “Donations will be accepted… all proceeds will go to benefit Camp Sunshine.”

Camp Sunshine is a retreat in Maine for children with life-threatening illnesses. It’s offered free of charge to children and their immediate families and offers on-site medical and psychosocial support.