A Question

This is from Anne:

One of my classes has gone completely NT.  About 2 months ago they created a character and the whole thing has exploded into this long, drawn-out epic story in installments.  We have been continuing the story on one day, then reading the latest installment and taking a T/F quiz on it on the following day.  It is, of course, more fun than anyone should be having in school.

The problem I have is this:  in my standards-based school, those T/F quizzes are considered formative assessments, worth 20% of the grade.  I need to come up with some kind of summative assessment, some kind of grand test, for all of this.

I just spent the last hour or so reading over all of the crazy stories and trying to picture how to make a test out of it.  I am just so lost.  One thought I have, is just to go in to the grades I have for the quizzes, and randomly make a few of them summatives in the grade book.  Or, not so randomly–pick a few that the students did really well on, so most everyone has an A.  A bit disingenuous, but I don’t agree with their system.

If you have any other thoughts I’d appreciate it.

Thanks

Anne