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

Other days

lisp

Lisp Day
kiss a ginger

Kiss A Ginger Day
girl friend

Girl Friend Day
nae nae

Nae Nae Day
hoodie

Hoodie Day
china

China Day
mean girls

Mean Girls Day
pick me

Pick Me Day
one

One Day
boba

Boba Day