First to comment! Wow! No traction whatever.
Lessons: 1) It was broadcast as the demonstration period is ending. I suspect notices were sent long before that got better response. 2) Should have included photos/videos from events that already happened, conveying the global magnitude of activities. 3) The link to current events is utterly, totally buried at the bottom, a communications disaster. That’s the most critical information being shared, and it is functionally invisible plain text, not even a different size or color!
Do another such event in three months, and next time you publicize it, put list the most ambitious demonstrations on the page, not in a link, in a bright box under the first paragraph with graphically distinctive type if not also some other graphics. And then put a conspicuous link below it for other events.