We usually found about 3-7 students was optimal, because it helps sell the program as a team/friends/family thing. If you only have one there, go ahead and make a power point or a poster showing the students designing, building, driving, cheering, and having fun together. Select photos which show a variety of emotions - joy of success, focus, laughter, and maybe even a bit of disappointment. Make sure the presentation uses “we” and “our” and names of some of several of the other students. Tell a story - don’t get bogged down in the philosophy (unless the audience leads you there).
Added: what might work well would be to select pictures that go with teamwork/success/failure/fun stories. Tell a story behind each picture, including using (first) names.