Final answer:
The creation of specialized departments within corporations for managing events is called Event Departmentalization, while the division of people or groups into extremes is known as polarization.
Step-by-step explanation:
The formation within major corporations of separate departments or divisions dealing with event management is referred to as Event Departmentalization. This specialization allows corporations to handle their event-related activities more effectively and efficiently, ensuring that every event is managed to meet the company's standards and objectives. In contrast, when people or groups are divided between two extremes on an issue, the challenge that is occurring is known as polarization. It is a social phenomenon where a community's attitudes towards a topic become more extreme, often leading to a sharp division within the group.