@abc.abstractmethod<EOL><INDENT>def get_event_form_for_update(self, event_id):<DEDENT>
return<EOL>
Gets the event form for updating an existing event.

        A new event form should be requested for each update
        transaction.

        :param event_id: the ``Id`` of the ``Event``
        :type event_id: ``osid.id.Id``
        :return: the event form
        :rtype: ``osid.calendaring.EventForm``
        :raise: ``NotFound`` -- ``event_id`` is not found
        :raise: ``NullArgument`` -- ``event_id`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

        *compliance: mandatory -- This method must be implemented.*