Broadcasted television shows are becoming more interactive. Some broadcast TV shows allow even home viewers without professional equipment to be part of them. In this paper we present an approach that takes this concept even further. In the proposed kind of participation television viewers will not only participate in the show through interaction or video streams, but also be able to create and host their own show. The core of the presented approach consists of the use of high-level models to describe the different aspects of the television show, and a generic runtime environment. This paper discusses this type of participation television, Staged Participatory Multimedia Events, and the supporting runtime environment in more detail. It also introduces the tool and the models that are used to support graphical creation of the structure and appearance of Staged Participatory Multimedia Events.