Terry, sorry, I really didn't mean to scare you. I'm probably overly paranoid but 30 years in law enforcement will do that to you.
![Smile [:)]](/trccs/emoticons/icon_smile.gif)
It would be a good idea to contact the tour chairman and find out if they've had any problems in the past and what kind of staff they provide at each layout. If I was your security consultant (I can be had for the price of a pair of new Walthers F-units
![Wink [;)]](/trccs/emoticons/icon_smile_wink.gif)
), I'd make sure everyone who was "official" staff was wearing orange vests like those you see at construction sites. I'd neatly letter them by function so their role was apparent to the public. For example, the guys you want to explain things to little Johnny and his dad would have vests that say "Information". Same thing with operators. I'd pick two of the biggest guys and label them "Security". All they have to do is not talk to people, stand at either end of the layout, and look stern. They can practice looking stern in the mirror.
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Make sure the route into and out of you layout room is clearly marked and that any other way into the house is either locked or physically blocked by a chair or table. I don't want to start scaring you again but you are inviting a bunch of strangers into your home and you should take some prudent precautions.