Oops, it doesn't look like 'cardiothoracic hand grenade day' is a national day..

Other days

ask out your crush

Ask Out Your Crush Day
lisp

Lisp Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
nae nae

Nae Nae Day
chocolate milkshake

Chocolate Milkshake Day
hoodie

Hoodie Day
blanket fort

Blanket Fort Day
pampering

Pampering Day
lash

Lash Day
special education

Special Education Day