Based on the original descriptions and comments, these videos are apparently a celebration of the Chinese(?) Buddhist(?) goddess Guanyin, who represents philanthropy in Buddhism. I don’t know what nationality the performers are, but the dancing is amazing and very beautiful. Enjoy!
#2. 《千手观音》在04雅典残奥会表演视频 by tysgjney.
After an initial orchestral piece, another group performs the 1,000 arms dance. I really can’t say much more about it, because I can’t read whatever language in which the description is written.
These dances are so beautiful. The number of hours of practice that must go into preparing for this dance is amazing. The costumes enhance the performances tremendously.