If the group is 100 but not much more, on Voyager, I can't imagine them closing Compass Rose for them, because I doubt there's enough dining capacity for the rest of the pax in the other venues. Perhaps it would make sense to put them in La Veranda for special dinners, let's hope for your sakes.

On Pip, the first night of the second cruise (b2b), the very large group (more than half of the 320 pax), took over L'Etoile. There was nowhere else for them to have a "group dinner", and there was enough capacity in La Veranda for the other passengers, coming and going, albeit feeding us a reprehensible buffet. There was indeed some "fighting back", but it didn't get us into the main dining room. It was only the first night, and most of their other special events didn't impact the other pax, at least not much. Tendering was somewhat disrupted. Entertainment was impacted, since none of these people came to the shows--too bad because they were excellent that trip.