I think if Peggy's final episode is going to work tomorrow night then it has to be just about the Mitchells and nobody else. We need to see a whole episode (or the most of it) with just Peggy, Phil and Grant. Perhaps Ben and Louise briefly as well, but the episode needs to centre around those 3 more than anyone. We don't need any distractions in the Vic or side plots, we need just the Mitchells. Otherwise Peggy's death won't work, or at least do the story the justice it truly deserves.
I've got a feeling though we will be getting the silly sideplots and we'll probably only see Grant for 15 minutes then he leaves again atter having a fling with either Sharon or Jane.