A few from the UKK go and have a super time, it's quite pricey and gets booked up very early on. There are, I believe very strict rules over what is and isn't allowed and what type of styles are and ain't allowed. I think I posted a video on here about it, but if not have a look at this for a taste of the show: http://uk.youtube.com/watch?v=LNcJfSajrb8
A friend went to this years with the classic stock cars and was amazed at everything, people dressed in period clothing and the whole atmosphere. It's also not a park-up-and-drink-beer show.