I went to the French Culture Center where a group of Lao Dancers were performing. I was told this group comes from a small village at the Nam Ngum Lake where this sword dance is a tradition. It is a quite basic, ancient dance, something we would expect from native groups somewhere in the Amazonas region.
Anyway, interesting insight in the tradiional Lao dance culture. a biit funny: Look close to the feet and see the socks and very modern shoes :-)