Oops, it doesn't look like 'wear your mets stuff day' is a national day..

Other days

Carpenters Day

Appreciate Yaself A Lil Extra Day

Embarrass Your Best Friend Day

Martini Day

Tulip Day

Frozen Yogurt Day

Camera Day

Get Funky Day

Ponytail Day

African Immigrant And Refugee Hiv And Hep Awareness Day