i just plain old wouldn't advise doing so. i work in downtown so if i wanted to, i could leave my car in the parking garage but that's about it.
The parking lot next to Live is just fine. I have done it a lot. I just come in at night or whenever pay, they give you a ticket for your windshield and then I would just leave it. If it's there when they get there they don't do anything.
If you park either real casual or real professional your good. They will smell your fear otherwise. Or... Buy a boot and boot your own car. They will assume you have been taken care of. When the time comes, unboot your car, and get going.