They’ve been doing dialogs and meetings together for fifty years.
Local churches have had their pastors and priests have periodic meet and greets and breakfasts once a month, kind of things forever.
It’s like people think denominations live in vacuums. They don’t and everyone in the real world knows that. All the priests and pastors know about all the others in their cities and areas, and they are all mostly civil if not more so.
But to try to twist out of this cordiality, some kindof getting together in terms of beliefs, unless one side is going to cave completely, that just is not going to happen.
You’re instead going to be left with some common-core, sloppy agape, false unity crap that is rightly going to appeal to no one who cares about actual doctrinal truth. But I am sure they’ll have a hell of a praise band whooping up the place.
I lived in a small town central New York all of the Churches got together for community outreach. Each of them took a separate area and made that the focus of their ministry so to reduce/ eliminate duplication of effort. All of them participated except for one of the Baptist groups. The Lutherans did the food pantry, two of the other Baptists took care of the clothing/ household items/ etc...
Both the Catholics took care of the Holiday outreach. The best was there was no sheep poaching.