Oops, it doesn't look like 'ChampsCampus Wide Hangover day' is a national day..

Other days

ruby

Ruby Day
first love

First Love Day
lisp

Lisp Day
singles

Singles Day
one

One Day
gallery

Gallery Day
tulip

Tulip Day
polyamory

Polyamory Day
ormille

Ormille Day
gum

Gum Day