I think there was intent to go to LV that night, but MI alerted, and intervened to stop the bigger event / dirty bomb. If potus doesn't go to WH, and instead flies from NJ -LV it fits in the timeline.
The bomb doesn't go off because it was foiled. The key to understanding the big picture event is trump using the word 'miracle' when he goes to visit.
The timeline would match the insider drop on 4 from a previous weeks prior, all of that seems to connect.
The 'sacrifice' is the reason why it hasn't been disclosed yet, it's much too hard of a pill to swallow.