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

Other days

book

Book Day
hiv awareness

Hiv Awareness Day
brow

Brow Day
ride the wind

Ride The Wind Day
ask out your crush

Ask Out Your Crush Day
lash

Lash Day
ruby

Ruby Day
kale

Kale Day
healing

Healing Day
one

One Day