I'd certainly welcome comments from any lurking Sinologists about the broader cultural context in which these photos could be seen, but barring any such intervention, let's just go ahead and enjoy these photos for what they are—a document of people doing stuff that people do at rock festivals. According to Sheldon, the festival "was pretty much all Chinese bands but the crowd was listening to anything and everything. That's what blew my mind—it didn't matter if it was a Chinese metal band or a mellow reggae-ish or folky band. The crowd was super into it." The power of music!