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

Other days

law

Law Day
donate your hair

Donate Your Hair Day
kale

Kale Day
prosecco

Prosecco Day
artists

Artists Day
carpenters

Carpenters Day
hiv awareness

Hiv Awareness Day
buddy

Buddy Day
stress awareness

Stress Awareness Day
china

China Day