Ask HN: Calendar Permutation Uses?

I'm thinking about making a calendar permutation web app that helps students plan their classes. It'd work like this:

- Student enters filters (days and hours he doesn't want class). - Student enters classes needed. - student can flip thru the various permutations of the resulting class schedule. (Permutations happen because each class has many different times.)

Now, would this idea work in any other fields? For instance, might this be useful to conference attendees planning their schedules? Any other uses?