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

Other days

emoji

Emoji Day
blanket fort

Blanket Fort Day
china

China Day
buddy

Buddy Day
one

One Day
hoodie

Hoodie Day
ask out your crush

Ask Out Your Crush Day
hiv awareness

Hiv Awareness Day
bow tie

Bow Tie Day
cuddle up

Cuddle Up Day