Implement the mechanism that allows to add items after a meeting has already been published. Those items may still be created during the meeting, if an attendee comes to the meeting and wants to discuss a new item.
Those items are items that have a "preferred meeting" that is already published. So we must first ensure that we can select, as preferred meeting, a meeting that is already published. Then, in the meeting view, those items (in the box "available items") need to be distinguished from the others. When the MeetingManager? presents those items to the meeting, they are added in a second, distinct items list ("Points en communication" in EGW; "Points dans le rapport et non dans l'ODJ" for PloneMeetingCommunes?).