What is the PURPOSE of your meeting?
After interview, 65% receive acceptance letters, 25% ar told they are wait-listed. Rolling acceptance. The wait-list is divided into categories of high, medium, low. Most from the high category get in, half from the medium, almost none from the bottom. Students may send in relevant supplementary information. Greatest movement from wait-list: August; about 10 taken from wait-list.
If you intend to ask why you are wait-listed instead of accepted, I suggest an indirect approach instead of putting the Dean on the spot with the question: "why didn't I get admitted instead of wait-listed?" There really is no satisfactory answer to that except either because there is rolling admissions and you were toward the back of the line or, all decisions have a certain arbitrariness about them and that's the way the chips fell. If you made the alternate list, especially the top half, then the luck of the draw is the most likely explanation.
A good approach is to ask "how can I make myself a better candidate if I have to reapply." That doesn't put the Dean on the spot and shows both your interest in the
school and a desire to improve.
Good luck.