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

Other days

carpenters

Carpenters Day
youth

Youth Day
self appreciation

Self Appreciation Day
me

Me Day
donate your hair

Donate Your Hair Day
kale

Kale Day
emoji

Emoji Day
kiss a ginger

Kiss A Ginger Day
kiss a brunette

Kiss A Brunette Day
girl friend

Girl Friend Day