That distinction matters because evangelism becomes either prideful or crushing when we forget it. If we imagine that another person’s conversion finally depends upon our persuasiveness, success can make us proud and failure can make us despair. But salvation belongs to the Lord.
The servant is responsible for faithfulness, while the harvest belongs to Christ. Andrew does not need Peter’s prominence to validate his own apostleship, and Peter’s prominence does not diminish Andrew’s obedience. Different servants receive different callings within the one mission of Christ.
The calendar is not an end in itself, and it should never become a substitute for the living Christ to whom it points. Its value lies precisely in its ability to return the Church to him, year after year, through Scripture, prayer, Sacrament, repentance, remembrance, and praise.