Oops, it doesn't look like 'wear your launch party t shirt day' is a national day..

Other days

Kale Day

Eat What You Want Day

African Immigrant And Refugee Hiv And Hep Awareness Day

Law Day

Self Appreciation Day

Buddy Day

Frozen Yogurt Day

Appreciate Yaself A Lil Extra Day

Gum Day

Embarrass Your Best Friend Day