The same situation came up last year – several excellent conferences are scheduled all at once. There is quite a bit going on at the church, but these times cannot be missed!
Rochester Conference: Scot McKnight spoke on the Jesus Creed (among other topics).
Pastors' and Wives' Refresher: It is what it says it is: refreshing! It is a good opportunity for me to catch up with by E-Free buddies and just spend time getting challenged and helped by people who are in very similar situations.
Desiring God Conference: Keller, Carson, Piper. A combo of any two of them would probably be enough to drag me up to Minneapolis. Add in Driscoll, Wells, and Baucham (don't know him, but I'm sure if he was invited, there is a good reason), a few old friends, and it should be a great conference!