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

Other days

unicorn

Unicorn Day
martini

Martini Day
artists

Artists Day
tulip

Tulip Day
ruby

Ruby Day
cursing

Cursing Day
my little pony

My Little Pony Day
healing

Healing Day
china

China Day
get funky

Get Funky Day