the're is really something like "the Gotha" there is even a book about it. It is called "Almanach de Gotha". It is a really serious thing. It wouldn't surprise me if there where really parties where you can only enter when you're in this book.
Almanach de Gotha - Wikipedia, the free encyclopedia
This high nobility they meet eachother also at the very expensive schools they go to. If you check, for example, Facebook, you can see that al this high noble young people go to the same schools.
Here is a link tho an online Gotha book. I don't know if it is completely correct and if everyone who should be in there is on this web-page.
An Online Gotha