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

Other days

bonang

Bonang Day
girl friend

Girl Friend Day
gum

Gum Day
pumpkin

Pumpkin Day
lisp

Lisp Day
frozen yogurt

Frozen Yogurt Day
offer

Offer Day
stud

Stud Day
ride the wind

Ride The Wind Day
china

China Day