Here is some information from the Pontifical Council for the Promotion of the New Evangelization concerning the annual event, “24 Hours for the Lord”.
Bishop Albert Thévenot, M. Afr. would like to encourage parishes to support this initiative in their parish clusters. Each year a different theme will be selected.
For further information please contact your parish, the Diocesan Liturgy Office or check the Vatican website: http://www.novaevangelizatio.va