Anyone with a Z3 based kit (250's) can come to the annual Zfest.
This year its being held at a watermill near Leicester/Loughborough, with over 200 cars. Any kits based on Z's seem welcome. Costs £2 per head. Just join Zroadster.org and book yourselves in.
It takes place on the 20th August and runs 11.00 till 16.30. Here's a link;
http://www.z4-forum.com/forum/viewtopic.php?f=14&t=89780(you probably need to cut and paste the link into your browser)