When I think about it, Jesus probably hid because it was so close to the festival and he wanted to have just this last day with his disciples.
Just this once this last chance to teach and to set his community together before the end.
There are a couple of things to note. Firstly that Jesus sends his disciples into the city, he does not go himself, clearly it has become to dangerous for him. They find a man carrying water jars. This was unusual, mostly it would have been a woman back then, so that to my mind indicates a pre-arrangement. Clearly the man who owned the house was taking a risk.
Second thing to note is that Jesus celebrated the passover, the festival right at the heart of Jewish identity with his disciples. Not his family as would have been usual.
The whole meal though actually is more about the identity of this community as opposed to the larger Jewish community that they all belonged to. This day clearly marks not just the beginning of the end of Jesus' life, but the beginning of his new religion. There are many who say that Jesus did not mean to start a religion, but I think if you look at these passages it is clear. He is setting things up for when he is not around anymore. The most clear evidence is his famous words with the bread and the wine.
When you meet together, Jesus says, in the future at this passover. You are to remember me. Not the Exodus from Egypt not the history of the Jewish people but me. And you must make remembering me the centre of this festival and this meal.
Jesus' teaching from the last supper is about the nature of the relationship which his disciples have with one another.
"Having loved his own, he loved them to the end" John chapter 13 verse 1.
So he washes their feet to indicate that they must serve one another, this radical equality is underlined by his naming of them as friends of his not servants. It has the feel of 'now I have told you everything, now go do...'
So having demolished hierarchical organised religion on Monday he then sets out a radical alternative with a new commandment. Love one another. Love is central, and so is welcome note please that Judas, whom Jesus knew, according to the accounts, would betray him, is there at table, with him. Though this is a community meal at which the Christian identity and community are central, it is incomplete without outsiders and those who feel they cannot belong.
This is for those of you beloved of Fresh Expressions a new way of being Church. It is still new 2,000 years latter because I don't believe it has ever been tried by the Church. A community with no one in charge and everyone serving everyone else.
And each person, thanks to the direct guiding of God's Spirit having as much right to lead and pray as anyone else. All MUST be equal. Jesus made that clear, when they argued about which of them was the greatest. No, there is to be no greatest, unless it is the greatest servant.
Finally he leads them and asks them to pray. Not for him but for themselves.
Yet they slept...and Jesus in spite of what he had just taught was finally alone...
As no one should ever be.
Then...those who came to arrest him were at his side.