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

Other days

bonang

Bonang Day
blanket fort

Blanket Fort Day
youth

Youth Day
gum

Gum Day
camera

Camera Day
boba

Boba Day
lash

Lash Day
pampering

Pampering Day
unicorn

Unicorn Day
ruby

Ruby Day