There are more representations (simulacra) than there are things in the reality (simulation). The U2 concert at The Sphere was but one event. But tens of thousands of experiences (simulacra) occurred there. Many more simulacra occurred online with the shared videos on platforms like Instagram.
A single recalling the moment repeated also brings about more simulacra. The single event created a multitude of simulacra, each an event in itself. Yet events are not the same as the objects (things) that participate in the event (process).