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

Other days

gum

Gum Day
bow tie

Bow Tie Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
eat what you want

Eat What You Want Day
stress awareness

Stress Awareness Day
frozen yogurt

Frozen Yogurt Day
donate your hair

Donate Your Hair Day
gallery

Gallery Day
first love

First Love Day
cursing

Cursing Day