If I understood correctly....

Well, from what I gathered, their presentation should kinda resemble a "haunted house" experience, so it's not something people can just sit on a chair and watch on screen. But the three can't tell them that (they can't say, go out and if you see something scary, that's us!!) so they probably used some bullshit presentation and are waiting for everyone to leave so that the "real" scary presentation could start....