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

Other days

african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
hiv awareness

Hiv Awareness Day
tell ur crush you like them

Tell Ur Crush You Like Them Day
coffee

Coffee Day
ormille

Ormille Day
blanket fort

Blanket Fort Day
self appreciation

Self Appreciation Day
kale

Kale Day
lumpy rug

Lumpy Rug Day
polyamory

Polyamory Day