The event as the culmination and driver of change is found in ancient civilizations. The breakthrough in economic terms took place in the twentieth century and was reflected in its impact on economic growth. The event is a phenomenon derived from leisure, business activities and tourism. As a unique moment marked by great risk, it requires an exceptional and specific organization. It is categorized by a multitude of different characteristics. The concept of event management encompasses the coordination and leadership of the people and teams involved in creating an event. The key elements responsible for the success of an event are planning and organization. We set measurable goals for the organization of events at the very beginning of the organization process so that we can finally show the extent to which they have been realized. Through marketing activities, we strive to sell the event and achieve a financial result or social impact. Among the most important factors in the organization of the event are long-term financial results. As a rule, financial management is intended to cover all costs incurred at the time of the event. Nowadays, an increasing number of corporations are emerging as organizers of conferences, congresses and various business gatherings. In order to make the organization of a congress as successful as possible, lately the organizers are increasingly hiring specialized agencies whose primary activity is the organization of congresses. A professional congress organizer or PCO is an agency specializing in working in the convention industry. The professional congress organizer provides a full service event organization from management, communication, marketing, finance and logistics. PCO allows the organizer to organize in a shorter time and reduce costs.