I've seen people waiting for a walk-in at BOS contemplate hopping a flight to EWR or JFK for a same day interview, but that's crazy if people are flying to BGR (which good chance means connecting), renting a car, and driving 2 hours each way to Calais to get their interview. Though makes me wonder, BGR has that big International Arrivals Building that mostly sits empty waiting for a diversion. I'm sure there's an empty corner in there, you could open an enrollment office.