The circle works well because you are facing each other. If you are having a peace circle in your room, then any open area would work. There are many issues that can be discussed at peace circle. The students and classroom in charge of the peace circle on a particular week can present their work in many ways. Read poetry that they wrote about the topic.
Role play situations that demonstrate their topic.
You may design this anyway you like. When all are present, the principal or a teacher asks the students to rise for the Pledge of Allegiance . At this time we sang a song. This could be a patriotic song or a peace song. Students then sit.