Oops, it doesn't look like 'dunk on nate silver day' is a national day..

Other days

stress awareness

Stress Awareness Day
first love

First Love Day
stud

Stud Day
bow tie

Bow Tie Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
cuddle up

Cuddle Up Day
pampering

Pampering Day
special education

Special Education Day
ponytail

Ponytail Day
my little pony

My Little Pony Day