There used to be an annual demoscene party in the UK called DejaVu, which is going back quite a bit now - 4 or 5 years since the last one I think? Anyway, DejaVu had low attendance and a handful of competition entries. It was organised (iirc) by the ukscene.org guys - the domain is now dead but I think some of the organisers, barog and sulphur, still frequent cfxweb.net?
I only know of a handful of UK sceners and most of them are inactive. UK demogroups? None active on the Amiga as far as I know - not since Nerve Axis fell silent 5 or so years go. Well, there is Fearmoths I suppose.
I remember the list of voters for one of the diskmags a while back (Eurochart or Showtime?) had about 5 or 6 UK people from ~200 voters. Poland, Russia, Germany seem to be the most active.
Bear in mind that Assembly and TG are quite overrun with LAN Gamers 'pwning n00bs' - the real sceners are a distant second. A purely demoscene party is going to attract much less interest. TRSAC and Spoletium for example. Scene parties tend to be over 2 or 3 days so it would have to be a venue with facilities - ie showers, toilets, eating and sleeping space etc.
