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

Other days

pumpkin

Pumpkin Day
polyamory

Polyamory Day
ask out your crush

Ask Out Your Crush Day
hoodie

Hoodie Day
boy friend

Boy Friend Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
special education

Special Education Day
eat what you want

Eat What You Want Day
my little pony

My Little Pony Day
bounce

Bounce Day