Hi there,
I found the general appointment lines were surprisingly effective for both DFCI and MGH actually!
MGH: 877-726-5130
Try that - hopefully if you tell them that you are from out of town and will be in the area for a consult for only a short time they can help accomodate you. At MGH you work with a tumor board consisting of a surgeon, radiation oncologist and medical oncologist. I don't know how often these panels are set up - we met ours on a Thursday. It might help to tell them that your Dad could potentially be a clinical trial option for one that Dr. Ted Hong is running. Even if it isn't an appropriate fit, appealing to a physician's research interests is never a bad way to get their attention.
On that, you could even try calling his office directly.
Ted Hong, MD - Director Gastrointestinal Service, Department of Radiation Oncology
This part is tricky, since you have to deal with administration...I found most people very helpful though. I'll PM you as well.