[[m:Bureaucrat]] shows that this is not a common configuration (requests are normally to be made to stewards for these kinds of rights removals), and since no previous wikimania20xx wikis had this configuration, a community consensus would be required.

Actually, is there even a community on this wiki, or are decisions made by fiat of some committee or group?

As nominal Chair of the Wikimania Committee, I guess I'm as appropriate as anyone to declare that such a config is fine.

Change 89179 had a related patch set uploaded by TTO:
Allow bureaucrats to remove advanced permissions on wikimania2014wiki

https://gerrit.wikimedia.org/r/89179

Change 89179 merged by jenkins-bot:
Allow bureaucrats to remove advanced permissions on wikimania2014wiki

https://gerrit.wikimedia.org/r/89179

Now fixed.