I'm in London. I've never heard of retro.directory before, but I'm trying to search on it now. It doesn't seem to make any difference compared with what I already knew about. I'd have to travel to your group in the Midlands, or the ones in Norwich, or Lincolnshire in the hope that there would be some classic Amigas there, instead of just NG Amigas running OS4.
Please point me to all these groups that only do NG. Cause there is only really SACC, which host Amiwest, that mainly focus on NG. However, even they have loads of classic machines, they even have a clinic evening, where people bring their classic amiga's for repair.
Apart from that, I have never been to a meet / show where there are no classic machines (I have been to lots all round the UK and Ireland). Infact there are always loads.
ZZapp!! is different to a certain extent, as its more of a general show. With every type of computer, console, arcade machine, even pinball machines.