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

Other days

frozen yogurt

Frozen Yogurt Day
polyamory

Polyamory Day
stud

Stud Day
pampering

Pampering Day
ruby

Ruby Day
my little pony

My Little Pony Day
me

Me Day
bow tie

Bow Tie Day
self appreciation

Self Appreciation Day
bubble bath

Bubble Bath Day