The season of Christmas begins on the day after Christmas and continues till the feast of the Baptism of the Lord. However, every year, the fist day after Christmas (except if it is a Sunday) is celebrated as the feast of St. Stephen the first martyr of the Church. The second days after Christmas is the feast of St. John the Evangelist and the day after that is the feast of the Holy Innocents. This is why the weekday readings during the season of Christmas begin from December 29.
The revelation of Jesus as a child begins in the Temple during the event of his presentation by his parents and through the mouths of Simeon and Anna. Jesus is indeed the Word made flesh and splendour of the Father. Before Jesus can begin his public ministry, John the Baptist bears witness to him and points him out as the Lamb of God. This identification by John, results in his own disciples going after Jesus, because they realize that while they did receive a great deal as disciples of John, they will receive the completeness of revelation in Jesus. The first words that Jesus utters in his public ministry are words that invite people to a change of mind and heart because they have been forgiven and loved unconditionally. The change is not a condition, but a consequence of having received unconditional love from God. Since his mission is a tangible mission, he shows this by feeding five thousand and satisfying them completely. He also walks on the water to show that he has subdued evil and that he is indeed Son of God. His Mission is to be available to all but very especially the poorest of the poor, the outcasts, the marginalized and lepers. He has come to heal and make whole those who need his healing touch.