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

Other days

brow

Brow Day
tell a fairytale

Tell A Fairytale Day
latina equal pay

Latina Equal Pay Day
ride the wind

Ride The Wind Day
gum

Gum Day
law

Law Day
believe

Believe Day
artists

Artists Day
tulip

Tulip Day
ponytail

Ponytail Day