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

Other days

singles

Singles Day
martini

Martini Day
bow tie

Bow Tie Day
cursing

Cursing Day
tell a fairytale

Tell A Fairytale Day
ponytail

Ponytail Day
artists

Artists Day
mean girls

Mean Girls Day
my little pony

My Little Pony Day
offer

Offer Day