Oops, it doesn't look like 'fuck boy day' is a national day..

Other days

tulip

Tulip Day
nae nae

Nae Nae Day
pumpkin

Pumpkin Day
lash

Lash Day
bow tie

Bow Tie Day
carpenters

Carpenters Day
boy friend

Boy Friend Day
stud

Stud Day
cat girl

Cat Girl Day
hoodie

Hoodie Day