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

Other days

self appreciation

Self Appreciation Day
bow tie

Bow Tie Day
youth

Youth Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
ponytail

Ponytail Day
carpenters

Carpenters Day
first love

First Love Day
fiancee

Fiancee Day
lost sock memorial

Lost Sock Memorial Day
coffee

Coffee Day