I’ve never heard that a bishop is not allowed to go to another church, though it might have been that he isn’t suppose to miss meetings in order to go to one. I’ll have to ask my bishop. This also might be something that a stake president had come up with.
He is a former bishop, sorry forgot to type that I guess.
Anyway, I called them (aunt and uncle) and asked if they wanted to hear their great nephew preach his first sermon.
My uncle said “Wow first sermon. Let me get back to you.” He called Saturday morning and said “Sorry we can’t make it, we are not allowed to attend.”. I actually laughed, thinking he was kidding. He just said “sorry I have to go” and hung up.