"The thing is, when a wedding is run correctly, NO singles, who aren't engaged, or about to be, are allowed to bring a date."
Really? With permission, I would think it would be okay, correct?
Asking permission to bring a date, is not only bad manners, in the extreme, but would be rebuffed by most. Unless, of course, it was a rather informal wedding and done on the cheap.
I take it that you have never been married/planned a wedding and have no idea what the correct etiquette is.
I recall when I was looking at wedding gowns I was asked 'how many people are invited?'
"150", I responded.
Her eyes got really big and she asked, "Really, what if they all bring someone?"
Now it was my turn to be shocked. I said, "Um, if a name is not on an invitation, then they are not invited."
That ended the conversation.