Jesus mostly avoided the big cities, and instead held his mass rallies in the countryside where he was free of interference from the Romans and their Sadducee collaborators. He became a wanted man, and was constantly on the move: “The birds have their nests, and the foxes their dens, but the Son of Man has nowhere to lay his head.”
His message was always the same: the unity of the Jewish people, the need for purification and submission to the will of God. And he made his points by stories (parables) and by vivid events (stage-managed miracles).
When he preached in the countryside he could attract crowds of up to 5,000 people. Obviously he didn’t just start talking, and have that many people show up spontaneously. These were publicized events. As at an outdoor event like Woodstock, some people would have brought food and drink with them, and others wouldn’t. But here there was nowhere to get food if you needed it.
Having preached to a large crowd, he would have a small boy come up and offer to share food – “five barley loaves and two small fishes”. He would praise the spirit of the boy, and ask everyone to sit down where they were, and for those who had brought food to share with whoever they were next to. They were all Jews, they were all God’s children, they were all one family. Jesus and the disciples and the whole crowd would share food between them as a communal celebration for one large family, and reinforce his teachings and their bonds as a single chosen people.
The miracle was in getting 5,000 people to share their food with strangers.
(And it was all done without rock music or recreational drugs.)