Wednesday, 21st August marks the 140th anniversary of the apparition in 1879, and a special day of celebration is planned to mark the occasion.
The competition will make young people more aware of Knock and what it is all about.
Daily ceremonies of popular novena to be streamed on shrine internet site and on Radio Maria.
Cardinal Timothy Dolan of New York and Primate of All Ireland, Archbishop Eamon Martin, among speakers at this year's novena.
