I have been to Audio Events as a Entry Paying Visitor where the Enthusiast / Hobbyist owner of Audio Equipment are sharing the Event with the Commercial Sector as an Exhibition.
For the Hobbyist Enthusiast there is to my knowledge nothing for sale on the day unless entered into a Charity Auction.
There might be a service offered by a few of the Hobbyist / Enthusiast attendees that is available to further investigated outside of the show.
The Commercial Sector are what they are, Exhibiting Items from a recent design and production as a clear purchasable item.
At Events like this, there are the Commercial Exhibits that raise to the occasion, and will insert into a System being exhibited a Source produced from a Vintage era, a Japanese DD TT or British ID TT are to be seen in place of an alternative recent design model as a Analogue Source.
The Hobbyist / Enthusiast are usually with a System that is made up of devices bordering on Vintage or actually Vintage. Their Sources used are ranging from Quite Old Tech, Recent Tech, Current Tech.
At such Events the Enthusiast / Hobbyist Exhibiting Rooms are constantly visited and able to hold visitors who are receiving demo's of the system with their own music brought along or the System owners selection.
Commercial Rooms are getting similar volume of footfall, but rarely are seen able to hold a captive audience for a period of time, as does the Hobbyist / Enthusiast. There is not really personalities involved, but the lesson quickly grasped is that a Audio System built using a range of products from different eras, is able to be extremely impressive as a system when assessing the End Sound. It is also quickly learnt if an inquiry is made or a little further investigation is carried out, that a system need not extend to much more than £5K to be an obvious competitor to systems costing in current New Purchase Markets £60K and ascending.
Getting out and doing footwork, having experiences of Audio Systems is the only way to have a really good lesson in a short time line. Reading about a device or system is only that, "Reading about a device or system". Reading is not experiencing End Sound.