@abc.abstractmethod<EOL><INDENT>def create_offset_event(self, offset_event_form):<DEDENT>
return<EOL>
Creates a new ``OffsetEvent``.

        :param offset_event_form: the form for this ``OffsetEvent``
        :type offset_event_form: ``osid.calendaring.OffsetEventForm``
        :return: the new ``OffsetEvent``
        :rtype: ``osid.calendaring.OffsetEvent``
        :raise: ``IllegalState`` -- ``offset_event_form`` already used in a create transaction
        :raise: ``InvalidArgument`` -- one or more of the form elements is invalid
        :raise: ``NullArgument`` -- ``offset_event_form`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure
        :raise: ``Unsupported`` -- ``offset_event_form`` did not originate from ``get_offset_event_form_for_create()``

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