Agree with the above about the cabin noise, just be respectful in the halls.
On the classics the concierge rooms are mixed in along deck 8. So no issues on those ships at all. The suite lounge and sundeck are not near the rooms. The Dream class does have a dedicated section (deck 11 and 12 forward) for the concierge rooms. At one time, when the Dream was first sailing, I believe they had gates to access the rooms. Those were removed years ago and anyone can walk through the halls.
Expect that the concierge lounge and sundeck areas will not be accessible for the group. The contact for the suite might be able to ask the concierge hosts if they can bring the group into one of those areas for part of the tour. It probably is not likely unless the group is on the small side and at a convenient time.