Today, more and more simulation tasks with a traditionally non-geometric background need to be embedded into some geometric context in order to provide spatial context to non-spatial data. This holds especially for graph-based applications in some location-aware context. As an example, one might think of a large theme park or a large commercial centre where the customers shall be provided with some navigation and scheduling information such as where to go when -- either a priori or even in real time via some mobile device. In this paper, we present an approach to embed an event-driven simulation tool for pedestrian traffic into a 3D geometric environment in order find an optimal path through the graph-based model by considering the congestions caused due to the pedestrian movements.