Taking place near Chiron's cave at Mount Pelion, this event saw the gifting of a golden suit of armor, a spear, and two horses named Xanthus and Balius to one participant, who was the brother of Telamon.
Prior to this event, one participant in it had subdued another participant despite the latter's transformation into fire, water, a lion, and a serpent. One participant in this event had been selected specifically due to a prophecy that any child born to another participant in this event would become more powerful than his father. Taking place near Chiron's cave at Mount Pelion, this event saw the gifting of a golden suit of armor, a spear, and two horses named Xanthus and Balius to one participant, who was the brother of Telamon. This event was also the site of the place where Eris, having not been invited to it, dropped an apple engraved with the phrase "To the fairest," thereby precipitating the conflict which would see the eventual death of the offspring born as a result of this event. For 10 points, identify this festive event which saw the union of the son of Aeacus and a Nereid, the parents of Achilles.
Prior to this event, one participant in it had subdued another participant despite the latter's transformation into fire, water, a lion, and a serpent.
{wedding} [or {marriage}] of {Peleus} and {Thetis} [both names required as well as some indication that a wedding was taking place]