Your organizer team comprises everyone working on one or more of your events. Their roles can range from Organizer Admins to event-level Content Team Members. Regardless of how large or small their role in your team is, you will need them as a part of your team. Assign them roles on the organizer level if they are supposed to manage various aspects of multiple events you are organizing, or at the event level if they are supposed to manage only specific event(s).
Each event organizer has a certain group of people, usually part of management, who can access data across all organized events. Depending on their roles, they have access either to all data in all events or data from certain event organization areas, such as finances, sponsorships and partners, or content, also across all events.
A common possibility for event planners is that team members only have access to the events' data they manage. Or 'event-level roles,' more colloquially known. These roles include Event managers (your team members who can manage all aspects of one event), Ticket managers, Finance Managers, Agenda Managers, etc. They are more granular than the organizer-level roles and are always event-bound.
This event-level role needs to be emphasized: a Content Team Member. These people evaluate and rate content proposals and are the foundation of the agenda-building process. Usually, they are external to your content team (not employed by your company). They have only one function: to oversee the submitted content in all or specific content buckets and rate it. This is the only role separate from the 'Organizer Admin' or 'Event Admin' roles (those admins need to be assigned this role specifically if they are supposed to evaluate content proposals).