Oops, it doesn't look like 'tragedy very sad day' is a national day..

Other days

believe

Believe Day
gum

Gum Day
youth

Youth Day
ruby

Ruby Day
lash

Lash Day
carpenters

Carpenters Day
lost sock memorial

Lost Sock Memorial Day
nae nae

Nae Nae Day
fiancee

Fiancee Day
boy friend

Boy Friend Day