Bleh. This was one of the worst experiences I've ever had in Vegas. It was August so it was already hotter than hell in the middle of the night. The crowd started congrating about 30-45 minutes before the "show" and before you know you're surrounded by what seems to be a couple thousand people. Hopefully you're not claustrophobic because if you are this crowd will bring it out of you and you should skip the show.
Granted, you should skip it anyway. The "acting" was horrible. The script/show made no sense and the singing was just an atrocity. I know the show is free, but it's still not worth your time.