Please create a new wiki for Wikimania 2014 now that London has officially been announced as the winning bid team.  I'm helping the London team sort this out, like I did last year for Bug 36477 (with probably an even more active role this time!).
Please use [[wm2014:]] as the interwiki prefix and install the translate extension. There are also some extra configuration settings needed as per Casey's comment on the Wikimania 2012 wiki creation bug.