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

Other days

cursing

Cursing Day
hannah

Hannah Day
hoodie

Hoodie Day
latina equal pay

Latina Equal Pay Day
kale

Kale Day
slime

Slime Day
tulip

Tulip Day
ride the wind

Ride The Wind Day
ruby

Ruby Day
lisp

Lisp Day