We took a cab to Sam Boyd Stadium from the Hard Rock for Popmart and then hung around with the rest of the stranded after the show until some buses showed up.
I have no idea how the parking is there, but I imagine sharing a cab might be a good idea to get there. Then, just see what happens after the show.
I'm going to try to get tickets for the Vegas show, but I'm not totally certain if I can make it or not. I've seen Popmart, Elevation and both Vertigo shows in Las Vegas, so it would be nice to keep the streak alive.
I wouldn't worry too much about making hotel reservations too soon. If you do, keep checking all summer and fall until the show, because it is easy to find that rooms get cheaper. Just don't lock yourself in with a prepaid/penalty-for-refund reservation site. Often with Vegas, your best price is directly from the hotel's web site. And, almost all hotels have a full refund policy on your deposit up until 1-3 days before you arrive.
But, grab cheap airfare as soon as you can. I hate to think how much I've overspent through the years because I didn't jump on a great airfare when I saw it.
Mark