Oops, it doesn't look like 'friendshipgirlfriendsisterand best friend day' is a national day..

Other days

Bubble Bath Day

Carpenters Day

Latina Equal Pay Day

Frozen Yogurt Day

Promposal Day

Mean Girls Day

Hoodie Day

Chocolate Milkshake Day

Embarrass Your Best Friend Day

African Immigrant And Refugee Hiv And Hep Awareness Day