Oops, it doesn't look like 'fucking something day' is a national day..

Other days

brow

Brow Day
unicorn

Unicorn Day
offer

Offer Day
pick me

Pick Me Day
my little pony

My Little Pony Day
boy friend

Boy Friend Day
latina equal pay

Latina Equal Pay Day
bonang

Bonang Day
lisp

Lisp Day
tulip

Tulip Day