(Re tues opposite fiber)
To my knowledge, I don’t know of tons of cross-over with my fiber folks doing both fiber and jewelry other than the random class. I don’t think it’s a big conflict at all.
We have two people that do jewelry, but they come to what interests them, sometimes fiber, sometimes other stuff. I encourage cross-pollination. There’s cool related tie-ins we can manufacture with most departments and suggest flimsy excuses for projects elsewhere when possible 
The way I look at it, folks will go to what attracts them. Let the chips fall where they may. It all benefits DMS in the end to have good quality classes, nice variety, and another thing that helps makers grow and use the great tools we have.
If we overthink dodging every possible conflict, keeping everyone happy, nothing could ever get scheduled. I say go for what works for your schedule. Thanks for the consideration on thinking about that, but I don’t think it will have much impact with either hurting fiber or cutting down on your students.
Re thurs nights
I think there are both pluses and minuses to class on thurs. Activity in the department for tours to see, but also more interruption/distraction.
Another idea since there are several open nights, mix it up, scatter the nights, which might help folks that could come only certain nights. See where the best nights fall. I think individual classes can benefit from this.
Main reason I started doing fibers on Tuesdays was 1) my schedule 2) tues seemed regularly free in ca 3) and because of the slow-build nature of fiber skills, we needed to give core repeat folks a predictable night.
If I’d just been doing random standalone classes, I’d have probably done it on all sorts of nights for various folks’ schedules