Oops, it doesn't look like 'corn on a cob day' is a national day..

Other days

tulip

Tulip Day
stud

Stud Day
tell a fairytale

Tell A Fairytale Day
brow

Brow Day
bow tie

Bow Tie Day
singles

Singles Day
frozen yogurt

Frozen Yogurt Day
stress awareness

Stress Awareness Day
believe

Believe Day
one

One Day