It's so hard to remember, while you attend a conference, that the convention centre is essentially a blank canvas on which your conference is drawn. Between shows most of the space is a giant empty room with concrete walls and floor. All the lighting, draping, signs, and screens are installed for the show itself - even the chairs are temporary. This amazing timelapse video shows you the keynote room at PDC over the days before, during, and after the show. One of the things I like is that you can see how often the keynotes were rehearsed in the actual room on stage with all the screens going. Full-on dress rehearsals are vital to a good presentation.
It's about 6 minutes long and parts of it are a bit dull (imagine what they would have been like at normal speed) but I'm glad I watched it.