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

Other days

artists

Artists Day
one

One Day
mean girls

Mean Girls Day
me

Me Day
eat what you want

Eat What You Want Day
latina equal pay

Latina Equal Pay Day
kiss a brunette

Kiss A Brunette Day
stress awareness

Stress Awareness Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
boba

Boba Day