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

Other days

artists

Artists Day
frozen yogurt

Frozen Yogurt Day
self care

Self Care Day
ormille

Ormille Day
one

One Day
tulip

Tulip Day
camera

Camera Day
promposal

Promposal Day
prosecco

Prosecco Day
eat what you want

Eat What You Want Day