I tried connecting and all I get is a stalled picture of the event with red blue circles moving across the front of the image..
Second look now the circles aren't there and the image is stalled.
Perhaps more participants are attempting to view this then their bandwith allows.
Sorry about that, Chris. It worked fine for me for a bit, then started stalling before the event ended. I saw a note on the end screen which referred to making the video available on climatetruth.org. You might have a look there.
The online live link isn't important. What's important is many participated in the Copley Square "Stand Up for Science Rally." and it was reported by numerous news organizations.