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

Other days

ormille

Ormille Day
law

Law Day
latina equal pay

Latina Equal Pay Day
blanket fort

Blanket Fort Day
bow tie

Bow Tie Day
first love

First Love Day
lash

Lash Day
camera

Camera Day
china

China Day
bubble bath

Bubble Bath Day