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

Other days

blanket fort

Blanket Fort Day
prosecco

Prosecco Day
ponytail

Ponytail Day
comfy

Comfy Day
self care

Self Care Day
frozen yogurt

Frozen Yogurt Day
one

One Day
cat girl

Cat Girl Day
self appreciation

Self Appreciation Day
ruby

Ruby Day