Oops, it doesn't look like 'park in croatia on world tourism day' is a national day..

Other days

coffee

Coffee Day
china

China Day
polyamory

Polyamory Day
kale

Kale Day
lash

Lash Day
ruby

Ruby Day
hoodie

Hoodie Day
boba

Boba Day
cat girl

Cat Girl Day
stud

Stud Day