Just last week a student registered for one of the Libraries workshops that I was the instructor for and sent me an e-mail requesting an ASL interpreter. What do you do? It's pretty easy to request an interpreter from Disability Services.
Just fill out this form: http://ds.umn.edu/OnlineForms/ICU_RequestForm.html
Unfortunately, the student now has a conflict, so I can't give you a run down as to how it went.