Oops, it doesn't look like 'drop yah nuts day' is a national day..

Other days

slime

Slime Day
ormille

Ormille Day
camera

Camera Day
lash

Lash Day
ponytail

Ponytail Day
stud

Stud Day
donate your hair

Donate Your Hair Day
bow tie

Bow Tie Day
bubble bath

Bubble Bath Day
kiss a brunette

Kiss A Brunette Day