Oops, it doesn't look like 'ridiculous hat day' is a national day..

Other days

martini

Martini Day

hot chocolate

Hot Chocolate Day

pick me

Pick Me Day

african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day

stress awareness

Stress Awareness Day

china

China Day

boy friend

Boy Friend Day

camera

Camera Day

ponytail

Ponytail Day

Emoji Day