Oops, it doesn't look like 'send a friend a card day' is a national day..

Other days

Singles Day

Hiv Awareness Day

Hannah Day

Prosecco Day

Cuddle Up Day

My Little Pony Day

African Immigrant And Refugee Hiv And Hep Awareness Day

Appreciate Yaself A Lil Extra Day

Brow Day

Raise Awerness Of Zeus Day