I was thinking of joining a Juneteenth rally, but when I found a site that was said to list the events, I found that the site depended totally on running nonfree Javascript software. Without that, the site would not show me anything whatsoever.

There will be another Juneteenth next year. If you can contact the people who run the site, please ask them to provide a way to download the whole list of scheduled events, so that people who won't run Javascript can see the list and show up at one.