Grand Tribunal material?

Are there any products in the 4th or 5th ed that deal explicitly with a Grand Tribunal or a meeting of one of the regional Tribunals? Are the actual regional Tribunal meetings covered in the individual Tribunal sourcebooks? I would love to develop a storyline dealing with the politics of an actual Tribunal meeting.

In case this question is woefully ignorant, I should explain that I'm just getting back to ArM after many years, having learned and loved the 3rd ed (apparently not a popular edition!)... I'm waiting for the 5th ed. core rulebook and a couple of other products, so perhaps my question will be answered by the knock of the UPS man tomorrow.