Bishop Alvaro del Portillo, the first successor to St Josemaria Escriva as leader of Opus Dei, is to be beatified in Madrid on September 27.
The ceremony is expected to attract 100,000 people from at least 50 countries.
Some 3000 families will open their homes to those travelling to Madrid from abroad and 2000 young people have signed up to work as volunteers for the event.
The current prelate of Opus Dei, Bishop Javier Echevarria, has sent a letter to all cloistered and contemplative nuns in Spain asking for their prayers for the beatification.
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