This is one of those things that requires the letter of the law behind any enforcement. You can admit to any crime you'd like, but absent evidence that there was indeed a crime, law enforcement can't exactly put you away for years.
Unless law enforcement found these people breaking the law, or "knew" that they did and found evidence of such, there's no recourse. Photos of people at an "illegal" gathering? Maybe the organizers indeed had a permit for whatever space they were in; maybe it was all staged inside a warehouse that they owned; maybe the whole story was concocted by the author.
Ultimately, unless they get caught or leave obvious evidence of exactly what took place in which location involving which people ... there's nothing to prosecute.
Edit: All that said, I'd hate to see the consequences of someone being seriously injured during one of these events. I'm hoping the "Agents" can get the person safely to the surface and that the injured party will remain mum on the details.
Unless law enforcement found these people breaking the law, or "knew" that they did and found evidence of such, there's no recourse. Photos of people at an "illegal" gathering? Maybe the organizers indeed had a permit for whatever space they were in; maybe it was all staged inside a warehouse that they owned; maybe the whole story was concocted by the author.
Ultimately, unless they get caught or leave obvious evidence of exactly what took place in which location involving which people ... there's nothing to prosecute.
Edit: All that said, I'd hate to see the consequences of someone being seriously injured during one of these events. I'm hoping the "Agents" can get the person safely to the surface and that the injured party will remain mum on the details.