Oops, it doesn't look like 'convention in two differrent states same day' is a national day..

Other days

Offer Day

Chocolate Milkshake Day

Bow Tie Day

Ask Out Your Crush Day

African Immigrant And Refugee Hiv And Hep Awareness Day

Nail Polish Day

Embarrass Your Best Friend Day

Frozen Yogurt Day

Boba Day

Hoodie Day