Oops, it doesn't look like 'stuff yer face day' is a national day..

Other days

unicorn

Unicorn Day
hot chocolate

Hot Chocolate Day
kiss a brunette

Kiss A Brunette Day
boy friend

Boy Friend Day
lash

Lash Day
bonang

Bonang Day
ormille

Ormille Day
slime

Slime Day
gum

Gum Day
ruby

Ruby Day