Very smart, very emty.

1,200 guests, surrounded by 65,000 empty seats.

The Detroit Economic Club arranged the event and sold tickets for it ($45 for members; $75 for non-members), and when two indoor venues sold out quickly, club officials moved the speech to Ford Field.
Beth Chappell, president and chief executive of the Detroit Economic Club, said in a statement: “The original plan was to host the Romney meeting in the atrium, which is where we host DEC meetings when at Ford Field. During our walk through with the security team there were further issues raised due to the size of the crowd so we moved the event to the field.”
washington post