Luke makes the point of telling us about Peter and the others who eagerly volunteer to build booths. This is an important detail. I think its there to remind us of the part of our nature that wants to hold on to things. But this is not to be. The disciples are to keep quiet about it.
Faith is to be a practice held silently in the heart and demonstrated vividly in the world.
Maybe that's the difference between the catacombs and the Vatican in Rome. You can stand in St. Peter's and feel overwhelmed by the elaboration and grandeur of the art and architecture. Or you can go to the catacombs and feel awed and humbled by the enormous risks taken for the sake of love. And it is that very same love which propels Jesus and the others back down the mountain. When God self-discloses God doesn't stand off at a distance.