I'm doing the NaNoWriMo thing again this year. I start it a lot of years and some years I finish it. I turned my 2010 NaNoWriMo novel into a book that's getting good reviews on amazon.com and this book takes place in the same town with some of the same people about a month later.
No, that's not the pitch for the book. That's an indication it's part of a small series of books that are related to each other. I'm not sure if I'd call it a trilogy yet. I don't know that it's got the right arc for a trilogy. It may be more of a series in that the setting and people are in common but the story arc isn't so much interrelated.