Oops, it doesn't look like 'ugly christmas sweat day' is a national day..

Other days

cat girl

Cat Girl Day
tell a fairytale

Tell A Fairytale Day
kale

Kale Day
hannah

Hannah Day
brow

Brow Day
ride the wind

Ride The Wind Day
pumpkin

Pumpkin Day
slime

Slime Day
boba

Boba Day
youth

Youth Day