I was in a discussion on Twitter with some people on the various sports analytics conferences that are either focused on soccer or have soccer-related forums. One such conference is the Science and Football conference in the UK, which had its inaugural meeting last year. The second edition of the conference has been confirmed for 18 March 2012 at the University of East London, Docklands campus. That's two weeks after the MIT Sloan Sports Analytics Conference.
You can register for the conference here. The conference fee is £100, which is a 10% rise over last year, but still lower than comparable symposia.