Oops, it doesn't look like 'convention on its opening day' is a national day..

Other days

Me Day

African Immigrant And Refugee Hiv And Hep Awareness Day

Pumpkin Day

Martini Day

Buddy Day

Appreciate Yaself A Lil Extra Day

Get Funky Day

Ask Out Your Crush Day

Ponytail Day

Raise Awerness Of Zeus Day