The Pope in January sent a letter to the children who are members of the society, to encourage them in their missionary activity.
Since 1843 the Missionary Childhood Society has helped children all over the world to work with the popes in their universal mission. On Saturday, as part of a day of festivity and prayer, the children will renew before the Pope their promises to be missionaries to their peers.
"In 160 years of missionary commitment, the desire of children the world over to be together apostles of Jesus has not wavered," wrote Monsignor Giuseppe Andreozzi, national director of the Pontifical Mission Societies in Italy.
The program includes a Mass in St. Peter's Basilica presided over by Cardinal Crescenzio Sepe, prefect of the Congregation for the Evangelization of Peoples, and a meeting with John Paul II.