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

Other days

african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
frozen yogurt

Frozen Yogurt Day
blanket fort

Blanket Fort Day
boyfriend

Boyfriend Day
hiv awareness

Hiv Awareness Day
bow tie

Bow Tie Day
lumpy rug

Lumpy Rug Day
stud

Stud Day
girl friend

Girl Friend Day
donate your hair

Donate Your Hair Day