Oops, it doesn't look like 'cups of the day' is a national day..

Other days

lash

Lash Day
lisp

Lisp Day
kale

Kale Day
ormille

Ormille Day
one

One Day
bonang

Bonang Day
blanket fort

Blanket Fort Day
aloxolt

Aloxolt Day
cuddle up

Cuddle Up Day
donate your hair

Donate Your Hair Day