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

Other days

buddy

Buddy Day
comfy

Comfy Day
ask out your crush

Ask Out Your Crush Day
lash

Lash Day
kale

Kale Day
youth

Youth Day
latina equal pay

Latina Equal Pay Day
blanket fort

Blanket Fort Day
boyfriend

Boyfriend Day
pick me

Pick Me Day