Oops, it doesn't look like 'anthem with your hand on your heart at the start of every day' is a national day..

Other days

Reading Day

Prosecco Day

Raise Awerness Of Zeus Day

My Little Pony Day

Unicorn Day

Tell A Fairytale Day

Emoji Day

African Immigrant And Refugee Hiv And Hep Awareness Day

Buddy Day

Pampering Day