Don't explain how you planned and implemented an experience for a team. This is not the right time to sneak in a personal accomplishment. Instead, use this question to show that you are a team player; cite an example in which you are merely a member of the team and not a leader.

"My supervisor brought in a consultant to evaluate our strengths and then to take a look at the team's strengths overall. We spent a full day together talking and learning about our strengths. The experience was very rewarding because it gave us time to appreciate and validate each other, but I think the most rewarding part was that some characteristics we might have thought of as annoying or off-putting were reframed in terms of how they helped the team accomplish its work, and we all left feeling more positive about our team and grateful for our colleagues."