Agenda lists hold the reminders for items to discuss with people and in meetings.
These lists tracks the topics and agenda items for people you interact with regularly. For example, if you have a standing meeting with a particular team, and want to capture agenda items to bring up at the next meeting, this is the place to capture them. The Agenda list is not for tracking next actions that you need to take related to that person or team (for example, a call you need to make to that person, which would instead go on your “Calls” list.) Once you’re on the call, you may refer to the Agenda list for that person, but it’s the Calls list that is triggering the action to make the phone call, not Agendas.
You could easily have half a dozen people and meetings that you are tracking this way—your direct reports, your boss, your assistant, your spouse, the weekly staff meeting, the monthly board meeting, etc.