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

Hoodie Day

Unicorn Day

Pumpkin Day

Bow Tie Day

First Love Day

Boba Day

Mean Girls Day

Tulip Day

African Immigrant And Refugee Hiv And Hep Awareness Day

Carpenters Day