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The photographers were professional hired photographers for the event. The author was asked to cover the event.

The point is that this "professional" photographer doesn't seem to be acting as professional as this kind of event calls for.

Did I read wrong, or was he not invited to cover the event?

I think it was less about getting caught and more about keeping the place secret so it doesn't get trashed and so that he can keep doing events like this in the future.

As soon as they publicized the event, they guaranteed that it would be locked down from this point forward. If you can't tell by the graffiti, many people have been there before them and kept it to themselves, but nobody else will in the future.