On the next day a large crowd that had come [to Jerusalem] for the Passover Festival heard that Jesus [also] was coming to Jerusalem.
Now this will happen in order to fulfill what was spoken by the prophet, saying,
Then they brought the colt to Jesus and spread their clothing on it and He mounted it.
So, they brought the colt to Jesus and spread their clothing on it, [then] placed Jesus on it [i.e., held the animal still as Jesus mounted it, since it had never been ridden before. See verse 30].
Now the Jewish Passover Festival was to be held soon and many people went up to Jerusalem from the countryside before the [actual] Festival in order to perform the ceremonial purification rituals.