NaNoWriMo

In nine days NaNoWriMo begins.  For those that do not know, NaNoWriMo is National Novel Writing Month.  Basically you write a 50k novel during the month of November.  I participated last year and reached the goal.  Planning to participate again this year as well.  Here's the problem, I am only about 10k into Midnight Town and I really don't want to start working on something new before this is finished.  I wonder if I can write the end of this one, and start another one to make my goal...