Of course the "authorities" will probably deny permission to hold the rally or possibly send in massive numbers of police and/or National Guard.

Stone Mountain braces for another armed protest - AJC

Now several far-right groups, including militias and white supremacists, are planning an answer rally on Aug. 15, and a broad coalition of leftist anti-racist groups are organizing a counter-demonstration.
In 2019, Stone Mountain Park closed its gates rather than play host to white militias seeking to use the park as a backdrop for a rally, citing the possibility for violence. That may happen again.
https://www.ajc.com/news/stone-mount...LAAM5LYYHTODM/