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

Other days

ruby

Ruby Day
carpenters

Carpenters Day
reading

Reading Day
youth

Youth Day
bounce

Bounce Day
bubble bath

Bubble Bath Day
cursing

Cursing Day
artists

Artists Day
prosecco

Prosecco Day
eat what you want

Eat What You Want Day