There are a couple reason for this.
Firstly, numbers as way down this year. With just over a week to go until the start of the convention, I would expect to be about 3/4 full. With current numbers the only game of mine I know is going to run is the Poker Club, the other two don't have enough yet to run. I believe part of the reason that numbers are down is too many freeforms on offer this year, and since I have multiple running I would rather cancel one than have neither of the two big game run due to lack of numbers.
Secondly, I still have a lot of work needing to be done on that game, and while I could get it all finished for the convention, I fear if I force myself I will end up with a sub-standard game. I don't want that to happen.
Thirdly, and perhaps most importantly, the game is not gelling correctly in my head, and if I do run it at the moment it will not meet my own standards. Usually when I write a game, I think of the initial idea and then let it sit in my head for a while, gathering other idea's and concepts until it's big enough and complex enough for it to run. I have had the idea for The Ferryman's Fee in my head since Conquest last year, and at the moment the only plot I have for it is the core plot line. A game needs more than just that core plot line and while I could force it, I would rather not. I would rather pull it from the current convention, concentrate on the other games I am running and am helping with, and leave it till later when I can give it the attention in deserves to be a good game.
Sorry to do this at such a late stage, but I think it's better that I do it now instead of get to the convention and have the game flop.