Oh the chaperone thing is just SO funny! And from what I gather, still in tact at least a couple of years ago. A prime example of this:
About two years ago I was in my local supermarket and I spotted a bro from my old cong wandering about aimlessly. He didn't seem to be buying anything, just wandering up and down the aisles.
Anyway, he spotted me and approached me for a chat. (Quite a few from my old cong still talk to me as I wasn't DF'd or DA'd even though I was baptized) This Bro is in his fifty's and is an elder.
So out of curiosity I asked him if he was shopping (as he didn't appear to be) He told me that he had gone to his fiance's house across the road and because she was alone she wouldn't let him in. She had phoned another bro to come round and chaperone them and until he turned up this elder was killing time in the supermarket.
So I kept him company until his cell phone rang letting him know that Bro Chaperone had arrived and it was 'safe' to go to his fiances house. Well. I had to laugh really.