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

Other days

lumpy rug

Lumpy Rug Day
book

Book Day
eat what you want

Eat What You Want Day
stud

Stud Day
ruby

Ruby Day
tell a fairytale

Tell A Fairytale Day
kale

Kale Day
bow tie

Bow Tie Day
singles

Singles Day
pumpkin

Pumpkin Day