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

Other days

boy friend

Boy Friend Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
one

One Day
cursing

Cursing Day
eat what you want

Eat What You Want Day
ormille

Ormille Day
gum

Gum Day
bounce

Bounce Day
pampering

Pampering Day
embarrass your best friend

Embarrass Your Best Friend Day