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

Other days

ruby

Ruby Day
lost sock memorial

Lost Sock Memorial Day
my little pony

My Little Pony Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
hiv awareness

Hiv Awareness Day
ponytail

Ponytail Day
cursing

Cursing Day
blanket fort

Blanket Fort Day
stud

Stud Day
mean girls

Mean Girls Day