The Lord Jesus appointed seventy-two disciples whom he sent ahead of him in pairs to every town and place he intended to visit. He said to them, "The harvest is abundant but the laborers are few; so ask the master of the harvest to send out laborers for his harvest." (Lk 10:1-9)
https://bible.usccb.org/bible/readings/101823.cfm
The four gospels are anonymous. The names attached to them come from the later church. Today’s celebration is more of a gospel rather than a gospel writer. And the Gospel that we call “according to Luke” is actually a two-part gospel: the gospel itself and its companion volume that we call the Acts of the Apostles. A significant feature in both volumes is the sending out of those who will carry the good news to the whole world. We are called to be the living gospel for all people to hear.