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

Other days

singles

Singles Day

african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day

hiv awareness

Hiv Awareness Day

kale

Kale Day

bow tie

Bow Tie Day

unicorn

Unicorn Day

youth

Youth Day

ponytail

Ponytail Day

believe

Believe Day

lost sock memorial

Lost Sock Memorial Day