There is an event in California or Washington State that does this regularly, using paid actors as zombies (with eye protection) and a few players pay (lots of money) to go in a survive an "apocalypse." The name of the facility/event escapes me at the moment, but I'm sure you can google a result or two.
They can give you logistical information, I bet. Legally speaking, though... this is a whole different ballpark.
Age Verifier - Lower Vancouver Island
Brotherhood of Nod - Nod Prime || Vancouver Island Airsoft League - President