Oops, it doesn't look like 'be miserable and be mean to everyone day' is a national day..

Other days

Embarrass Your Best Friend Day

Cuddle Up Day

Unicorn Day

Chocolate Milkshake Day

Eat What You Want Day

Healing Day

Tell Ur Crush You Like Them Day

African Immigrant And Refugee Hiv And Hep Awareness Day

Comfy Day

Hannah Day