You should probably get the gist of this event already, but if not then you should check out this previous post announcing and the event book written by Paul Cornell.

Writer Paul Cornell has penned classic episodes from the Doctor Who TV series ('Father's Day', 'Human Nature/Family of Blood', both Hugo-nominated), classic Doctor Who novels, as well as successful comic book runs on titles such as Wolverine, Action Comics, Demon Knights, and Captain Britain and MI:13.