Oops, it doesn't look like 'broadcast day' is a national day..

Other days

hoodie

Hoodie Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
me

Me Day
bounce

Bounce Day
blanket fort

Blanket Fort Day
donate your hair

Donate Your Hair Day
hiv awareness

Hiv Awareness Day
my little pony

My Little Pony Day
lash

Lash Day
lost sock memorial

Lost Sock Memorial Day