From the Sunday readings

Matthew 21: 1, The Lord enters Jersualem

When they had come near Jerusalem and had reached Beth'phage, at the Mount of Olives, Jesus sent two disciples, saying to them, "Go into the village ahead of you, and immediately you will find a donkey tied, and a colt with her; untie them and bring them to me. If anyone says anything to you, just say this, "The Lord needs them.' And he will send them immediately." 

This took place to fulfill what had been spoken through the prophet, saying,

"Tell the daughter of Zion,
Look, your king is coming to you,
humble, and mounted on a donkey,
and on a colt, the foal of a donkey."

The disciples went and did as Jesus had directed them; they brought the donkey and the colt, and put their cloaks on them, and he sat on them. A very large crowd spread their cloaks on the road, and others cut branches from the trees and spread them on the road. The crowds that went ahead of him and that followed were shouting,

"Hosanna to the Son of David!
Blessed is the one who comes in the name of the Lord!
Hosanna in the highest heaven!"

When he entered Jerusalem, the whole city was in turmoil, asking, "Who is this?" The crowds were saying, "This is the prophet Jesus from Nazareth in Galilee."

The Lord enters Jerusalem as the city is preparing for Passover. Many are streaming into the city from all corners of Palestine, the Near East, Africa, Achea, and points beyond, to mark the Passover in the holy city, fittingly so, for many of these will then return to their corners of the world with the good news on their lips, of the Lord's triumphant resurrection and promise of life. The Lord constantly tells his disciples and apostles, that all is happening as it has been laid out in Scripture--down to the very detail of precisely when and how the Lord is to enter into the city. Prior to their arrival the Lord has performed several miracles and has notably, instructed that "the first will be last and the last will be first." He has also explicitly told them that the Son of Man will be given unto his enemies by one of his very own, flogged and crucified, and rise again on the third day. It is a miraculous sequence of events, venerated for millennia as Holy Week in all of Christendom.