National Friendship Day Day is observed annually on the first Sunday in August. Celebrate Friendship Day 2017 on August 6, Sunday. Body Spartan is dedicated to providing the latest cutting edge fitness, nutrition, and supplement information so you can meet and exceed your fitness goals. In the spirit of National Friendship Day on Sunday, August 6, 2017, Body Spartan is offering four day sale from August 4 to 7, 2017. Get an additional 20% off supplements with code FRIENDS20.