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

Other days

promposal

Promposal Day

boyfriend

Boyfriend Day

kiss a ginger

Kiss A Ginger Day

special education

Special Education Day

chocolate milkshake

Chocolate Milkshake Day

blanket fort

Blanket Fort Day

stud

Stud Day

cursing

Cursing Day

kiss a brunette

Kiss A Brunette Day

first love

First Love Day