What does it mean that I can send a symposium?

A person may be interested in organizing their own symposium for the congress on a specific topic of Clinical or Health Psychology. In this case, that person (the chair of the symposium) has contacted 4 or 5 people so that each one presents their work around a central theme. For these symposia, the coordinator must send these works (abstracts) together, including the name of the coordinator and the title of the symposium.