If you're looking to have the students engage with Wikipedia's systemic bias, I think it might be more worthwhile to have them evaluate existing deletion debates (and similar discussions) -- rather than having them contribute directly to Wikipedia.
I think it would be easier for them to look at a larger number of cases, and observe without having their personal attachment to an article come into play, if they read stuff that they haven't been involved in.
-Pete[[User:Peteforsyth]]