Oops, it doesn't look like 'Everyone Can Fuck Off day' is a national day..

Other days

eat what you want

Eat What You Want Day
ruby

Ruby Day
nail polish

Nail Polish Day
lisp

Lisp Day
pumpkin

Pumpkin Day
china

China Day
offer

Offer Day
tulip

Tulip Day
gum

Gum Day
my little pony

My Little Pony Day