Oops, it doesn't look like 'girlfriendboyfriendbest friend or sister day' is a national day..

Other days

Nae Nae Day

Aloxolt Day

Girl Friend Day

Lumpy Rug Day

Tell Ur Crush You Like Them Day

Polyamory Day

Healing Day

Ormille Day

Bow Tie Day

Embarrass Your Best Friend Day