For example, one group might be in charge of the overall organization of the event. They should decide the day on which the event will be held, where it will be held, and how to get parents to come. Encourage the group to really talk out each decision, and think about the pros and cons involved. Another group might be in charge of food. Other groups can be tour guides and lead the parents through a display of their peace-promoting work.
Teams can also teach classroom songs, read favorite stories, or create goods to sell to parents.
Students may want to share aloud the writing they've done for this project. You might want to invite the media or a local celebrity to the events, to raise the public's awareness of what the children have learned and what they have accomplished toward promoting peace. Of course, all the teams can offer suggestions to the other teams.