Oops, it doesn't look like 'river clean up day' is a national day..

Other days

law

Law Day
ormille

Ormille Day
healing

Healing Day
self care

Self Care Day
buddy

Buddy Day
unicorn

Unicorn Day
self appreciation

Self Appreciation Day
nae nae

Nae Nae Day
ponytail

Ponytail Day
china

China Day