Call Vegas hotels and pretend to be scouting for a place for a celebrity to stay who will be under disguise. Ask questions about their security in case a fan mob forms or about back entrances to avoid the lobby and what not. They will get you on the phone with a manager so fast who will bend over backwards to answer your questions, the more details you need the more they assume you work with a very high profile celebrity. Then just mention you work in the entertainment industry out of New York and you don't want any more questions asked but if they need further verification once you've book then you can provide that.

You'll get a deal whether or not a celebrity shows up for that room once you book.