Oops, it doesn't look like 'anthem you do not like the language you do not like the day' is a national day..

Other days

Carpenters Day

Pumpkin Day

Get Funky Day

My Little Pony Day

China Day

Polyamory Day

Gum Day

Lumpy Rug Day

African Immigrant And Refugee Hiv And Hep Awareness Day

Frozen Yogurt Day