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

Other days

hoodie

Hoodie Day
one

One Day
donate your hair

Donate Your Hair Day
get funky

Get Funky Day
cat girl

Cat Girl Day
brow

Brow Day
lisp

Lisp Day
ride the wind

Ride The Wind Day
bubble bath

Bubble Bath Day
camera

Camera Day