Oops, it doesn't look like 'took a knee on mlb opening day' is a national day..

Other days

Pumpkin Day

Tulip Day

Cuddle Up Day

Boba Day

Gum Day

African Immigrant And Refugee Hiv And Hep Awareness Day

Offer Day

Bonang Day

Tell Ur Crush You Like Them Day

Hiv Awareness Day