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

Other days

camera

Camera Day
kiss a ginger

Kiss A Ginger Day
china

China Day
artists

Artists Day
ask out your crush

Ask Out Your Crush Day
frozen yogurt

Frozen Yogurt Day
fiancee

Fiancee Day
self care

Self Care Day
one

One Day
youth

Youth Day