I was a caterer in a former life, so I have some idea of the enormous amount of work involved in pulling an event like this off. Just plating the food takes time and many willing hands when you have to do it 600 times. Then the plates have to be actually delivered to the tables -- er, beds.
I never worked an event where the tables and chairs had to be built first, though. These beds came from Ikea, so there was a certain amount of assembling involved. Kudos to the team behind this -- we got to just sit on the beds and eat and talk and laugh. They made it possible.