Oops, it doesn't look like 'pizza and day' is a national day..

Other days

hot chocolate

Hot Chocolate Day
gum

Gum Day
cuddle up

Cuddle Up Day
buddy

Buddy Day
china

China Day
pampering

Pampering Day
kiss a ginger

Kiss A Ginger Day
self care

Self Care Day
carpenters

Carpenters Day
first love

First Love Day