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

Other days

ride the wind

Ride The Wind Day
lisp

Lisp Day
bow tie

Bow Tie Day
youth

Youth Day
latina equal pay

Latina Equal Pay Day
believe

Believe Day
chocolate milkshake

Chocolate Milkshake Day
boy friend

Boy Friend Day
brow

Brow Day
kale

Kale Day