Oops, it doesn't look like 'thanks for reminding us we are all single day' is a national day..

Other days

Polyamory Day

Blanket Fort Day

Camera Day

Lumpy Rug Day

Tell A Fairytale Day

Promposal Day

Bonang Day

China Day

Frozen Yogurt Day

African Immigrant And Refugee Hiv And Hep Awareness Day