docs: def addPerson(self, nickname):
          """
          Create a new L{Person} with the given C{nickname}.
  
          @type nickname: C{unicode}
          @param nickname: The value for the I{name} attribute of the created
              L{Person}.
  
          @raise L{liveform.InputError}: When some aspect of person creation
          raises a L{ValueError}.
          """
          try:
              self.organizer.createPerson(nickname)
          except ValueError, e:
              raise liveform.InputError(unicode(e))