This chapter looks at communication processes, at the collaboration required to run a successful event. The event environment, due to its turbulent and temporary nature, can provide real challenges for effective communication. Sharing knowledge within and across events can be unreliable, although new technologies are assisting in storing and disseminating a wide range of information. The importance of data collection, research and evaluation cannot be stressed enough. For the industry to become more professional, the process of event operational planning needs to be improved and consolidated, particularly where there are serious threats to safety. Event evaluation provides a lasting legacy for future events.