Oops, it doesn't look like 'organizations to encourage coordination between day' is a national day..

Other days

Cuddle Up Day

Tell A Fairytale Day

Kiss A Brunette Day

Slime Day

African Immigrant And Refugee Hiv And Hep Awareness Day

Carpenters Day

Healing Day

Tell Ur Crush You Like Them Day

Book Day

Ask Out Your Crush Day