Oops, it doesn't look like 'best friend post a picture with people you hung out with once day' is a national day..

Other days

Stress Awareness Day

Carpenters Day

Embarrass Your Best Friend Day

Self Appreciation Day

Frozen Yogurt Day

Pampering Day

Girl Friend Day

Raise Awerness Of Zeus Day

Bow Tie Day

African Immigrant And Refugee Hiv And Hep Awareness Day