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

Other days

offer

Offer Day
raise awerness of zeus

Raise Awerness Of Zeus Day
cursing

Cursing Day
youth

Youth Day
get funky

Get Funky Day
camera

Camera Day
gum

Gum Day
tulip

Tulip Day
nail polish

Nail Polish Day
boy friend

Boy Friend Day