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

Other days

my little pony

My Little Pony Day
law

Law Day
pick me

Pick Me Day
bubble bath

Bubble Bath Day
hiv awareness

Hiv Awareness Day
hannah

Hannah Day
cat girl

Cat Girl Day
gum

Gum Day
one

One Day
ormille

Ormille Day