Oops, it doesn't look like 'grid says there could be a gas deficit in britain by the end of the day' is a national day..

Other days

Gum Day

Self Appreciation Day

Brow Day

Stress Awareness Day

African Immigrant And Refugee Hiv And Hep Awareness Day

Bonang Day

Comfy Day

Kale Day

Lost Sock Memorial Day

Girl Friend Day