[ButKnillinoi]

Unless compelling evidence is provided to the contrary, I will assume that, other than providing a homily, Metropolitan Hilarion will not be an active celebrant of this service. In that a separate Catholic Mass will also be held before hand makes me think that the Catholics will certainly not be actively celebrating this obviously Anglican service either, although they will evidently be in attendance as well. There have been other similar situations where an Orthodox hierarch was in attendance and provided a homily without celebrating , but sat on a chair away from the altar to the side through the service with other invited clergy from other churches.

O those Anglicans and their happy little "branch theology". At least they will hopefully be exposed to an authentic Orthodox view in the homily, although I inwardly cringe a little at the appearance of impropriety that the weak brother may be led astray.