Although it's going to be very much a multi-format party, with little focus on the ZX (well, about as much focus on the ZX as on the other platforms, I guess), I think that the upcoming Sundown 2005 party is worth a mention. Because it's taking place in the UK. Yeah, it's not often that the demoscene has a UK event, and now there are two in one year. I'm a bit busy with work at the moment, so for now I'll point you to the original announcement (the confirmation that the party will go ahead), and to a party forum.
The event is taking place I think down the road from me (well, about an hour drive away), so I'll try to be there, tho' it's the weekend of my brother's birthday so I'll see what I can do. Check it out, especially if you're a scener (from any platform) in the UK. Yes.