Well, here is the basic breakdown of DarkStalkers from the HOT website.
Originally Posted by NateTheGreat
Upon arriving each group (NOT each person) is given ONE glowstick. After all participants sign a waiver of liability the group enters over 10,000 square feet of total darkness where monsters and mayhem await.
It is up to your group to find its own way out. There is no preset path. Inside the depths of the darkness a horde of monsters roam freely, equipped with the latest in night vision technology, ready to reap havoc upon all those that enter.
As you navigate your way through DarkStalkers it is not uncommon for participants to get lost, separated from their groups, and/or have their glowsticks stolen by the terrors that lurk inside.
For some the experience lasts 15 minutes, for others the experience last for HOURS. This event is not for the faint of heart and is not recommended for those under the age of 13.
Important Information: There is no predetermined path, there is not time limit, and there is no escape. If your group cannot find its way out or if anyone becomes too frightened, we will NOT escort them out.
If your group’s glowstick is lost or stolen by a monster we will NOT replace it.
All who enter will be REQUIRED to sign a waiver before entering.
It doesn't say it here, but I've read in other places that the monsters wear night vision goggles so that they can easily see the patrons, but the patrons can't see the monsters . . . at least, not until they're up close.
Also, while it doesn't say so, I'm sure if there are all these rules and stipulations, signing waivers and whatnot, then one of the caveats is that you have to relinquish your cell phone and other potential sources of light, tho, actually, trying to navigate total darkness with nothing more than a pen-light or whatnot could make for an amusing experience (at least on the part of the monsters).
One of the advantages of glowsticks is that they're cheap and easy to use, and for those customers who manage to retain their sticks, they can be branded so you can have a great souvenir or giveaway.