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

Other days

slime

Slime Day
pumpkin

Pumpkin Day
believe

Believe Day
hannah

Hannah Day
cursing

Cursing Day
kiss a brunette

Kiss A Brunette Day
lumpy rug

Lumpy Rug Day
girl friend

Girl Friend Day
kiss a ginger

Kiss A Ginger Day
ponytail

Ponytail Day