I was finally able to access Celebrity and gain some insight into my question. Yes you can ultimately add someone to your reservation after your upgrade bid has been accepted. However this would come at a cost. In our case the Upgrade to a Royal Suite on the edge departing next week would be $2836.00 for the extra person. Not terrible, but for that amount they or close to it, they could get an inside cabin. Of course all the perks of the suite category would not apply. So the answer is yes for Celebrity. but at a substantial cost. Thank you for responding to my question very kind!
