They didnt specify. What I heard was: “The event planners in Las Vegas that were working with a Major Sponsor had been tipped off by people they knew inside the Las Vegas Sheriff department that as many as 400 arrests are planned at the event”
Like I said, this particular group told us they had invested over $70,000 in this event in Las Vegas and if they decided they were willing to write that off and not attend they must have felt strongly that the information given them was accurate.