 The floating stage on which Jarre and his musicians performed was built on top of four large barges . Large purpose @-@ built display screens were built , and one of the buildings to be used as a backdrop was painted white . One large mirror ball being transported to the event fell onto the roadside , causing a degree of confusion as some people mistook it for a fallen satellite . World War II searchlights were installed , to illuminate the sky and surrounding architecture . Along with thousands in the surrounding streets and parks , 200 @,@ 000 people watched Jarre and guests such as guitarist Hank Marvin perform in less than ideal conditions . Inclement weather had threatened to break the stage from its moorings , putting paid to the original plan to float the stage across the Royal Victoria Dock . Wind speeds were so high that television cameras were blown over . On the second evening the audience , which included Diana , Princess of Wales , was soaked by rain and wind . 
