Oops, it doesn't look like 'donate your hair donate your hair day' is a national day..

Other days

cat girl

Cat Girl Day
bow tie

Bow Tie Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
first love

First Love Day
tell a fairytale

Tell A Fairytale Day
coffee

Coffee Day
artists

Artists Day
boba

Boba Day
offer

Offer Day
my little pony

My Little Pony Day