It is so frustrating. This game is supposed to be about strategy. So when you come up with one for the WD event and everyone in the faction is sticking to it except one or two members it drives you mad. What can you do? Nothing, except posting a message on their wall and watch while your previous months build up for the WD campaign is ruined and your game play for the next 3 days.
As a new feature I think you should be able to kick people from the faction during WD. Failing that (as some might think it unfair to kick players) the leader should be able to suspend a player so that they can no longer declare war or attack people. That way they can't mess up strategies by ignoring orders, but will still get any rewards the faction end up winning (so they can't complain).