This week, I have been attending the Dagstuhl seminar on event processing. The seminar is conducted in a castle, in the midst of a very scenic and remote countryside in Germany. The calm atmosphere encourages sharing, innovation, and trust – this is also aided by the abundance of beer and wine at the venue . Rooms at the castle cannot be locked from the outside, and apparently there has never been a theft or loss as a result of this choice. The seminar this year is focusing mainly on creating a single document that defines the concepts and facilities, and outlines the desired future and research challenges in the area of event processing. I have been closely involved with setting a context for event processing and its relationship to other disciplines, including the areas that are predecessors, contemporaries, and applications of event processing.