Oops, it doesn't look like 'championships in different sports on the same day' is a national day..

Other days

Azonto Is Acceptable Day

Cuddle Up Day

Stress Awareness Day

Prescription Drug Take Back Day

Comfy Day

Lost Sock Memorial Day

Hot Chocolate Day

Kiss A Ginger Day

African Immigrant And Refugee Hiv And Hep Awareness Day

Martini Day