Each person in the group is given an appointment card – that is: a card which has space for 3 names on separate lines (with 1 extra line underneath each name) and 3-4 sharing questions at the bottom or reverse side of the card. Give everybody time to go and make an appointment with someone else in the group.
Make it very clear that appointments are with each other (ie. if person x makes an appointment with person y, then person y also makes an appointment with person x).
Allow about 10 seconds for each appointment to be made and then have everybody sit down (or you may want to sing a song or do something else). Then when you’re ready say “it’s now time for your first appointment!”. Everyone in the group goes to their first appointment and asks the other person the 3-4 sharing questions written on the appointment card. Allow about 2-3 minutes for each appointment and then finish the mixer by asking some in the group to share who the met and the answers to the questions.