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

Other days

buddy

Buddy Day
lisp

Lisp Day
kiss a ginger

Kiss A Ginger Day
prosecco

Prosecco Day
girl friend

Girl Friend Day
bow tie

Bow Tie Day
unicorn

Unicorn Day
ormille

Ormille Day
polyamory

Polyamory Day
self care

Self Care Day