It's been discussed in other threads, but I propose that campwerks become a non euro-specific event. Instead, I think that attendance should be limited to club members and that they're welcome to drive/bring any drive-worthy car that they own.
I don't suggest this for my own benifit (since I'm sure I could've brought the subaru down last year) but I just think it's more of a weekend about hanging around with buddies and going on a nice cruise. It's not really about cars, so I see no reason to draw the line that way.
My other suggestion is pre-registration. I also think it'd be fun to pick new locations each year. That may be too much work, though.