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

Other days

boy friend

Boy Friend Day
bow tie

Bow Tie Day
hoodie

Hoodie Day
china

China Day
cuddle up

Cuddle Up Day
reading

Reading Day
offer

Offer Day
ruby

Ruby Day
brow

Brow Day
hiv awareness

Hiv Awareness Day