Who Do You Think You Are? Live

Who Do You Think You Are? Live is an annual family history event that has been held at the Olympia National Hall, London since 2005 attracting between 10,000 and 15,000 visitors per year. The show consists mainly of exhibitions, stands and break-out sessions for individuals wishing to learn more about researching genealogy, family history and building family trees.

Wikipedia has more about this subject: Who Do You Think You Are? Live