Learning enough about one other person to be able to introduce them to the entire group. All participants get to hear about other participants from the perspective of a third party instead of hearing from the person themselves. Provides a bit of a stretch for participants to have to ask someone they just met to tell them enough about themselves to introduce them.
Pair off the audience. Have the teams interview one another. Then have each take a turn introducing the other to the audience at large. Interviews should be timed (begin, end) anywhere from 1-2 minutes to ? depending on how much time you want to allow for this activity.
You can prepare questions ahead of time or provide just general guidelines for the interview. You may want to ask people to pick someone to interview that they don't already know.