I am not in Scotland, but hope you do not mind my input on this!!
Some years ago I went to a smallholders show over at the Great Yorkshire Showground. I keep hoping to see it advertised again, but haven't. Maybe its still on every year and I miss it. I really enjoyed it. There were lots of trade stands of interest to the smallholders......and demonstrations going on. There were plenty of folk visiting so I am sure whatever you organise would be a success.
Personally, I think its a good idea, and for me, practical demonstrations on laying hedges, dry stone walling, draining fields, help with choosing suitable tractors and equipment for small scale use, as well as advice on livestock and feeding .....reps from feed companies etc.