Are Constantine and Anne-Marie still in Athens? It would be the first royal wedding there since theirs in 1964. I don’t think quiet is part of their agenda, it will be a big wedding with Pavlos walking her down the aisle because with Constantine’s health deteriorating I don’t think he’ll be able to.
IMO, Konstantinos will be fine in a wheelchair but it's very possible he wouldn't like to be seen in a wheelchair in public and/or in such a happy event.
Yes, they live in Greece, not in Athens but in Porto Heli, an area in northern Peloponnissos, right across from Spetses island and very close to Hydra. I don't know if they're currently in the country or abroad but AM hadn't be seen abroad recently, so I believe they're both here. When he visited Spain for the celebrations of Sofia and Juan Carlos' birthdays, imo he went too far, physically and metaphorically. It must have been too much for his health. I hope he's ok though and in a case of a wedding he will be able to attend and celebrate with the rest of the family.