I have sent my questions to the people in charge to get you a better answer, in case you were excited about the prospect of attending the first ever International Trout Congress in Bozeman, Montana this summer. If you were, I guess you and I will have to hold our enthusiasm until the summer of 2016 now.
I learned of the postponement as I was going on the World of Trout site to register. Apparently, they have only announced this news Thursday morning on their facebook account and also on their website. See for yourself here .