Oops, it doesn't look like 'hq will be closed day' is a national day..

Other days

coffee

Coffee Day
boy friend

Boy Friend Day
bow tie

Bow Tie Day
kiss a brunette

Kiss A Brunette Day
self care

Self Care Day
bounce

Bounce Day
law

Law Day
get funky

Get Funky Day
brow

Brow Day
lisp

Lisp Day