I was there in Billings, but only for one night as I had to get somewhere else. I'll agree about the wind. It was horrible. There was a stretch of I-25 north of Cheyenne where I wouldn't dare take even one hand off the grip, and my helmet felt like it was getting ripped off my head twice. I saw some 18 wheelers blown over. Possibly the worst wind I've ever ridden in and it lasted for over a hundred miles. Thankfully it got much better for my ride back. The flooding was at it's peak during the rally, so mother nature was putting on quite a show! There were nearly submerged buildings along the Yellowstone River very close to the hotel.
I rode my F6B to that rally and there were several others. In fact, I think there was at least one of every color Honda made.
Here's some of the flooding...