You can insert a region into an agenda by editing the agenda in the meeting screen.
Click the region before which you want to insert the region.
When the edit region menu appears on the right, choose the Add a region below this region button.
Select the region that you want to add. It will be inserted immediately below the region that you clicked.
You can add as many regions as you want and even duplicate regions that are already in the agenda.
Sometimes the list of available regions may extend beyond the bottom of your screen. To make the entire list visible see The list of regions to choose from extends beyond the bottom of my screen.