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

Other days

lisp

Lisp Day
bounce

Bounce Day
nae nae

Nae Nae Day
camera

Camera Day
offer

Offer Day
bubble bath

Bubble Bath Day
lumpy rug

Lumpy Rug Day
buddy

Buddy Day
self care

Self Care Day
bow tie

Bow Tie Day