When we were in Luang Prabang about 15 years ago, someone convinced us that we should go to a large "disco" which was a short ride to the northern outskirts of town. It was probably the only disco in LP, and maybe the only disco north of Vientiane.
There were about 1,000 local youth dancing in unison. They seemed to be completely choreographed, kinda like in a parade or a marching band. My friends and I tried to dance with them, but we didn't know the steps / moves. And we were a bit drunk.
It was definitely one of the most interesting discos I've ever been to.
I saw some big bars with lots of lights on the outstide of town on the way to the bowling alley, we may have passed that disco. It sounds like it would have been a lot of fun to find. Always more interesting when you're surrounded by local people.