Earth Hour happened all over the world. You probably know more about it than I do. I did not go down to the strip. I took a quick peek at about 15 minutes into it and the Stratosphere tower, Circus, Encore, WynnDot, Palazzo, some of Harrah's, Rio, Palms, Planet Hollywood, Mandalay Bay, and the Luxor beam were all lit.
My list is a lot longer than the newspaper's list. Maybe some just dimmed their lights, maybe there were timing issues, maybe some lights take longer to shut down and restart than others.
Personally, I was opposed to the event. In the past, dimming the lights was a significant honor for a fallen star. If Al Gore wants to hug a tree, that's one thing. To ruin a Las Vegas tradition is another. In response to earth hour, I turned on everything I could find with a switch in my house before I left for work.