Linda,
You are a super sleuth for finding this, it's priceless
I love the fact that there are old, young and all ages in between singing this song with mucho gusto!!! It actually reminded me of the feeling here on this forum but we can't see or dance with each other

Well, I suppose we do verbally.
It seems to be filmed in a local town hall or some similar building. The fact that there is a variety of all ages could be that it is a religious group. Check out the coffee urn and cups and the wall hanging for more clues
