Oops, it doesn't look like 'operetta is held in the framework of the day' is a national day..

Other days

African Immigrant And Refugee Hiv And Hep Awareness Day

Comfy Day

Tulip Day

Pampering Day

Carpenters Day

Lost Sock Memorial Day

Artists Day

Hoodie Day

Appreciate Yaself A Lil Extra Day

Bubble Bath Day