Oops, it doesn't look like 'oj simpson day' is a national day..

Other days

lash

Lash Day
comfy

Comfy Day
slime

Slime Day
singles

Singles Day
mean girls

Mean Girls Day
eat what you want

Eat What You Want Day
boba

Boba Day
youth

Youth Day
tell a fairytale

Tell A Fairytale Day
blanket fort

Blanket Fort Day