It's possible that they invited the White Council (Though I doubt it.) but no one could attend on one day's notice.
Martha Liberty and Ramirez were attending the vote to expel Harry, Eb, Christos and Listens were in the hospital, Rashiid was at the Gates, Chandler is MIA, Kimiko, the cowboy and Morgan are all dead or worse and the Merlin and Luccio were at the Harry meeting.
Harry would have been the logical choice, but they were expelling him. We'd have needed a new character for there to be anyone capable of representing the White Council.