Oops, it doesn't look like 'royale high diamond appreciation day' is a national day..

Other days

raise awerness of zeus

Raise Awerness Of Zeus Day
artists

Artists Day
kale

Kale Day
me

Me Day
lisp

Lisp Day
blanket fort

Blanket Fort Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
special education

Special Education Day
polyamory

Polyamory Day
coffee

Coffee Day