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

Other days

slime

Slime Day
boba

Boba Day
cuddle up

Cuddle Up Day
hoodie

Hoodie Day
reading

Reading Day
ruby

Ruby Day
pumpkin

Pumpkin Day
unicorn

Unicorn Day
comfy

Comfy Day
self appreciation

Self Appreciation Day