The Amiga had a whole range of experiences. It's historical to show the lower end of them, too.
What about games that didn't have such great sound or graphics but were fun anyway. For example, Adventures Through Time.
There's got to be an OCS machine cranking through a 3D render the whole time. You could time it so that it finishes right at the end of the event and people could cheer on the last few lines. (Or even have a contest to get a prize if someone guesses the correct render time.)
There should be a VCR playing a tape with old commercials and promos on a big old CRT TV. I remember that Amiga World had an animation contest. Does anyone have a copy of the winning entries? That would be cool to add, too.
What about an A500 connected to a TV with an A520?