This is a really good idea--the finish-a-thon. To quote kerravonsen, who thought it up:
Remember all those poor, neglected plot bunnies that have been starving from lack of attention, because all those ficathons kept on having higher priority? The stories you wish you could finish, if only you could find the time? Well, fear not, the finish-a-thon is coming to the rescue! So dust off those neglected story ideas and sign up.
The finish-a-thon is a ficathon, with all the ficathon-like things like deadlines and fellow volunteers to encourage you, but with this ficathon, you write your own ideas. But since part of the encouragement of a ficathon is writing things for other people, what we're going to do, is vote for which story ideas people should write.