This is likely the "religious conference" that was attended by the six imams who were subsequently removed from their airplane. From the Lileks blog, with thanks to LGF:
Hmmm. According to the TV, the men said they were in town for “a religious conference.” Interesting. I was talking today with a guy I know; he’d been at a suburban hotel for an annual company sales meeting. The regional manager was having a difficult time speaking, since the party in the next conference room was praying about as loudly as is humanly possible, and had followed the prayers with a speaker who expressed in rather . . . forceful terms the depth of Muslim oppression in America. Unless there are several Muslim religious conferences going on in Minneapolis at the moment, I’d guess that might be the one. If so, I wonder if the reported truculence of the men might have been influenced, or at least reinforced, by the speaker. Whoever he was.