This text explores the philosophical definition of the terms event and change, examining their mutual relationship. To speak of an event, one must first assume the possibility of change. Commonly, change is perceived as a transition between being and non-being, where something ceases to exist and something new emerges. However, the author points out the risk that such a conception might lack a deeper connection between the old and new states, aside from elements that persist unchanged. The key to defining an event lies in identifying a relevant and real relationship between what has passed, what has newly emerged, and what persists through time. An event is thus not merely a sequence of unrelated states, but a structure where continuity plays a fundamental role. The text emphasizes that this connection must not be merely attributed to reality by an observer but must be inherently present. Only by uncovering these internal links between the mutable and the constant can the phenomenon of an event be fully grasped as a distinct philosophical problem.