Oops, it doesn't look like 'banana cream pie banana cream pie day' is a national day..

Other days

ponytail

Ponytail Day
bonang

Bonang Day
fiancee

Fiancee Day
lumpy rug

Lumpy Rug Day
tell a fairytale

Tell A Fairytale Day
tulip

Tulip Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
cat girl

Cat Girl Day
cuddle up

Cuddle Up Day
bow tie

Bow Tie Day