It's pretty unusual for a party to fly an environmentally-friendly banner overhead, though it's not something I'd put past the Burning Man crowd.
I do like that you went there however, because partying and consumerism overlap substantially. And TFA amounts to green-washed consumerism.
This is coming from someone who has spent entire days working from beaches powered by a portable solar panel. It was certainly a celebration of how far solar panels had progressed that the thing could power my thinkpad all day. But it would have been asinine and dishonest for me to portray it as environmentally-friendly. I just added more e-waste to the existing plentiful powered outlets everywhere situation, because I wanted to be at the beach and play with a solar panel.