My eccentric grandmother used to do a song night when the new song book came out. Every Friday evening anyone would be welcomed over and she would put on different tracks and we all had a good sing song. She even cooked curry followed by a home-made fruit crumble. When I was in and oh so spiritual I used to thoroughly enjoy it as I do love the songs -even now. It was never well supported though. Average of 5/6 each time and usually by the same ones lol.
But doing it karaoke style? Could be considered as blasphemy by the elders so tread carefully! I had to jump through hoops to do a murder mystery evening once - in helped my cause by inviting an elder to it who loved them and was able to smooth it over for me ;)