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

Other days

boy friend

Boy Friend Day
believe

Believe Day
raise awerness of zeus

Raise Awerness Of Zeus Day
lisp

Lisp Day
fiancee

Fiancee Day
kale

Kale Day
artists

Artists Day
lumpy rug

Lumpy Rug Day
bubble bath

Bubble Bath Day
bow tie

Bow Tie Day