The interviewer would like to know that you have the confidence to lead a meeting successfully. Think about a time when you have driven a meeting - big or small. This example could be a phone meeting, a lunch and learn, or a large client presentation.
Begin by telling the interviewer the reason for the meeting, who was involved, and what approach you took to prepare for the meeting. Finally, be sure to mention why you felt the meeting was a success! What did you do in that meeting to create an effective and positive outcome?