On 10th February 2018, His Eminence John Cardinal Njue led in the celebration of Mass to mark this year's Pontifical Missionary Childhood (PMC) Day at St. Marys Msongari. He also launched this year's PMC theme, "Peace be with you," 
(John 20:19-21)

His Eminence called on the children to imitate God their Father. “Be imitators of God, as dearly loved children and live a life of love, just as Christ loved us and gave himself up for us as a fragrant offering and sacrifice to God,” he added.

Over 40,000 children thronged the ground drawn from 13 deaneries in the Archdiocese of Nairobi.