On a recent trip to San Francisco I found myself strolling round Golden Gate Park with a friend at exactly this time, as part of the Earthday celebrations.
Or at least so I was led to believe.
Turns out that at this time, on this day, in this location a number of like minded individuals gather to meet and celebrate. It was quite a thing to behold. After being part of the celebrations for a while, even the drumming circle managed to sound cogent.
I took a short video of the event, on my phone, so I'm afraid the quality isn't great. Nevertheless, I thought I'd share, I'm sure you'll get the idea.