Oops, it doesn't look like 'jose canseco let a homer bounce off his head day' is a national day..

Other days

Hoodie Day

Lisp Day

Frozen Yogurt Day

Buddy Day

Nail Polish Day

Embarrass Your Best Friend Day

Prescription Drug Take Back Day

African Immigrant And Refugee Hiv And Hep Awareness Day

Aloxolt Day

Lash Day