Oops, it doesn't look like 'hitler weed columbine day' is a national day..

Other days

Stress Awareness Day

Appreciate Yaself A Lil Extra Day

Promposal Day

African Immigrant And Refugee Hiv And Hep Awareness Day

Offer Day

Tell A Fairytale Day

Believe Day

Ride The Wind Day

My Little Pony Day

Frozen Yogurt Day