One of the main facets of the PYP Exhibition is the ability for students to work collaboratively. Teams of students are asked to work together with a common goal, heading toward a common goal. This is not always easy for students (or adults for that matter!) and it could be really worthwhile to spend some time having newly created groups or teams come together and figure out how they are going to work as a team.
One part of this could involve having the students design their workspace. Giving the students the chance to create a learning space and have a dedicated wall space and learning blog may help them figure out their roles and purposes as a group.
Another way, would be to dedicate a few minutes each day for the first weeks of Exhibition to some team-building time. While looking at the Destination Imagination website, I saw these team building exercises. They are pretty standard exercises that you may be familiar with but they also come with the reminder that time for reflection needs to be built into the exercise and they offer these suggestions for post-exercise evaluation:
Here is the link to the PDF download of instructions and exercises.