Oops, it doesn't look like 'flag is deemed to be too political a symbol for st andrews day' is a national day..

Other days

Aloxolt Day

Tell A Fairytale Day

Comfy Day

Eat What You Want Day

African Immigrant And Refugee Hiv And Hep Awareness Day

Ormille Day

Blanket Fort Day

Artists Day

Polyamory Day

Martini Day