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

Other days

prosecco

Prosecco Day
buddy

Buddy Day
coffee

Coffee Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
embarrass your best friend

Embarrass Your Best Friend Day
martini

Martini Day
hiv awareness

Hiv Awareness Day
azonto is acceptable

Azonto Is Acceptable Day
donate your hair

Donate Your Hair Day
self appreciation

Self Appreciation Day