I would think the low spec systems could be used to showcase some the most loved games and demos (especially those that were difficult for other platforms of the time).
Some of the unusual (on other platforms) hardware configurations might be of interest, like a low spec machine running a RAD with only extra FAST ram. Warm booting would be amazingly fast as would calling programs from RAD. This might be a good system to demo the awesome power of the dir utils (advanced and almost unique) that evolved on the Amiga. (Strangely, Amiga always had much more of its share of text readers as well. Other platforms used editors to read a file.)
Examples of original, low spec machines doing things that evolved years later, like playing Mp3s with a MasPlayer.
Pick a popular serial linked game and have that running on 2 machines.
Moving up to more expanded systems, an Amiga could be linked to the net. If an older browser is used, perhaps sites should be limited to compatible ones like Aminet, Wikipedia, etc.
For those attendees who are unfamiliar with Amiga, it would be great to show off what is under the hood hardware and software wise. Those admired attributes of the OS (dynamically allocated ram disk, multitasking, logical and straight forward system organization, the way the cli AND workbench were tightly integrated (WB was not splashed on top of a DOS, they were 2 facets of the same powerful OS), the clever icon system, the very small size and responsiveness of the system (near realtime) etc.) could be demo'ed.
Much could be said of the Amiga's native sound abilities, not only great quality playback, but sampling as well. We made this (
http://aminet.net/mods/smpl/VoiceOfAmiga.lha) in a matter of days with a DSS8+. (Shameless plug,
It would be excellent if an Amiga could be set up to run a presentation with sound and images of its own history, technology, features, etc in a long continuous loop, all unassisted by a user! An interactive presentation would be even better, if not harder to produce in the time allotted. Amiga was, after all, billed as the first multimedia platform!
My 2 cents.