Okay, got a chance to talk to said faculty member. They don't trust the above mentioned staff member to carry out this task with the attention it deserves. Ouchity-ouch. I'll do this this time, but only because the Director asked the faculty member to invite this guest. I'll act like it's no problem, when it's really a pain in the ass.
However, unless the Director is involved, this will not happen again. They need to figure out what to do with this staff person. I know the whole building likes to consider the adminstration staff as their extra helpers, but this is pushing it.