Oops, it doesn't look like 'FriendshipGirlfriendSisterAnd Best Friend day' is a national day..

Other days

ask out your crush

Ask Out Your Crush Day
hiv awareness

Hiv Awareness Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
ride the wind

Ride The Wind Day
nail polish

Nail Polish Day
fiancee

Fiancee Day
boyfriend

Boyfriend Day
boy friend

Boy Friend Day
one

One Day
mean girls

Mean Girls Day