Feast of the Transfiguration of the Lord

What is this feast all about? Let's refer to Wikipedia, shall we?

- The Transfiguration of Jesus is an event in which Jesus was transfigured upon a mountain (Mount Tabor?) It put Jesus above the two preeminent figures of Judaism: Moses and Elijah and also supported his identity as the Son of God
- the Feast of the Transfiguration is observed on 6 August and is considered a major feast

And here's something Pope Benedict XVI preached about the Transfiguration (taken from http://www.vatican.va/holy_father/benedict_xvi/angelus/
2006/documents/hf_ben-xvi_ang_20060312_en.html):

Today's Gospel reading re-proposes to us the episode of the Transfiguration of Christ on Mount Tabor. Awestruck at the sight of the transfigured Lord who was speaking with Moses and Elijah, Peter, James and John were suddenly overshadowed by a cloud, out of which came a voice which proclaimed: "This is my beloved Son on whom my favour rests; listen to him" (Mk 9: 7).
When one has the grace to live a strong experience of God, it is as if one is living an experience similar to that of the disciples during the Transfiguration: a momentary foretaste of what will constitute the happiness of Paradise. These are usually brief experiences that are sometimes granted by God, especially prior to difficult trials.
No one, however, is permitted to live "on Tabor" while on earth. Indeed, human existence is a journey of faith and as such, moves ahead more in shadows than in full light, and is no stranger to moments of obscurity and also of complete darkness. While we are on this earth, our relationship with God takes place more by listening than by seeing; and the same contemplation comes about, so to speak, with closed eyes, thanks to the interior light that is kindled in us by the Word of God.