Some years ago when the AMF was formed, a UPC pastor said to me, "Yeah, they (the AMF) don't think they've had church unless they've beat somebody up." Maybe this liberal pastor is invited so they will have somebody to beat up.
Opening prayer could be:
"We thank God that we are not like others,
like those who are staying with the UPC,
like those who don't act, think, or dress right,
like those with computers, monitors, and televisions,
or even like that liberal pastor over there...."
(paraphrase of
Luke 18:9-14)