Thank you for the explanation. Much appreciated.
I studied heraldry in my wasted youth, and I would have been able to blazon those arms and Google to see which Bishops they belonged to.
If the poster mentioned which Diocese held the event in the picture, we could probably find the information.
The number of dangling curtain-tassels on the sides indicates the rank of the Bishop, so the one in the center (from our perspective in the photo) is probably the Archbishop of the region. It looks like the one on our left is at the front, so that’s probably the arms of the local Bishop who’s carrying the Blessed Sacrament. The third one could be an auxiliary of the Archbishop, a retired Bishop, or just a guest.