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

Other days

bow tie

Bow Tie Day
ponytail

Ponytail Day
hot chocolate

Hot Chocolate Day
artists

Artists Day
blanket fort

Blanket Fort Day
kale

Kale Day
ruby

Ruby Day
cursing

Cursing Day
law

Law Day
boy friend

Boy Friend Day