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

Other days

martini

Martini Day
nae nae

Nae Nae Day
my little pony

My Little Pony Day
bounce

Bounce Day
bonang

Bonang Day
hannah

Hannah Day
girl friend

Girl Friend Day
unicorn

Unicorn Day
promposal

Promposal Day
china

China Day