Sprints or meetings have a "driver", who is a person or a team that you can designate as the "organising committee of the meeting". The driver of the meeting has permission to approve or decline topics for the agenda of the meeting.
How to set the driver
You can designate the driver of the meeting (har har) when you register the meeting, or afterwards by editing the meeting details. In each case you will see a field like this:
The driver is listed in the sprint details portlet, usually displayed on the top right of all pages related to the sprint: