I'm so very glad you are questioning certain details, that's why you wonder what is truth in the book and what is fiction.
Fan's were allowed into "Neverland," after the verdict was read because they have told us as much. I've also seen where there was one party that was thrown in Michael's honor that fan's had put together, because there is video of it on youtube.com, but when Grace is quoted in the book, I'd take that with a grain of salt.
Maybe because of the "People" magazine article is where the author of the book, Tanner Colby, is quoting as his source. Maybe Grace is the one behind the story and maybe this is another reason Michael Jackson wasn't very fond of her, as Paris Jackson testified. After all, during the time period that Grace and the bodyguard's were around Michael, working, somebody was tipping Roger Friedman off. This detail was talked about in the bodyguard's book, that Michael would set up the bodyguard's to see if they were going to the Press about his personal life. During this time period, Grace was mentioned quite a bit, as she was the power behind the throne and running Michael's empire, which we know is not true. Just the salacious headlines had the reader being told were true about Michael Jackson. The bodyguard's just confirmed the obvious, that different management came and went and how this came about, because Michael was losing trust in what he believed at first, was something to help him, business wise. Londell McMillian was hired because it was his speciality, as a lawyer, to help a person to restructure their finances, when it seems no one else could. Tom Barrack wondered why he was being approached by Michael Jackson's people, when Ron Burkle had been involved with Michael and his finance's and if Ron Burkle couldn't do it, what was going on, financially speaking with Michael. This is why I have questioned the validity of the book.