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

Other days

martini

Martini Day
youth

Youth Day
ruby

Ruby Day
hot chocolate

Hot Chocolate Day
kiss a brunette

Kiss A Brunette Day
boba

Boba Day
ponytail

Ponytail Day
kiss a ginger

Kiss A Ginger Day
fiancee

Fiancee Day
ride the wind

Ride The Wind Day