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

Other days

gum

Gum Day
ormille

Ormille Day
brow

Brow Day
tell a fairytale

Tell A Fairytale Day
polyamory

Polyamory Day
coffee

Coffee Day
bonang

Bonang Day
my little pony

My Little Pony Day
tulip

Tulip Day
cuddle up

Cuddle Up Day