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

Other days

slime

Slime Day
frozen yogurt

Frozen Yogurt Day
pampering

Pampering Day
ruby

Ruby Day
hoodie

Hoodie Day
healing

Healing Day
ormille

Ormille Day
self appreciation

Self Appreciation Day
comfy

Comfy Day
bounce

Bounce Day