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

Other days

nail polish

Nail Polish Day
lash

Lash Day
blanket fort

Blanket Fort Day
book

Book Day
eat what you want

Eat What You Want Day
comfy

Comfy Day
boba

Boba Day
brow

Brow Day
slime

Slime Day
singles

Singles Day