It would be interesting to make a fake gas attack video like this in the USA. The first released version would appear to be the real thing. The second one would show the "making of" version, like this one does.
Of course you can't drug babies to keep them quiet. But babies tend to take regular naps. Get some young mothers involved and have them lay their babies to sleep in another room. When they are all asleep, the mothers carefully transfer the babies to the set. Then the cameras role, and the mothers pretend to be wailing and crying over their babies. Glycerin drops in the eyes and onion juice can provide real tears. Later, the mothers will dub their real voices wailing and crying, but during the filming it has to be quite so the babies don't wake up.
The older children will play dead. One or two will have fake foam applied to their mouths. There will be signs in the background that prove this happened in the USA. A flag on the wall, a view out the window that can be geolocated to a US city.
Play the game and show how people are manipulated. Dominate the news for a couple of days with the gas attack on US soil, interviews with crisis actors and so on. And then show how the scam was pulled off.