The exact number of young people who came to Duisburg for the party is still unclear. What is clear, however, is that it was far more than could fit into the area the town had made available for the event . Mass panic broke out in a cramped tunnel when too many people attempted to get out at the same time. It was a fatal mistake: at least 20 people fell or were trampled in the chaos and hundreds more were injured. The Loveparade’s safety procedures are now under fire, but the organizers of other European mega-events also have a lot of lessons to learn from this catastrophe.