aesthyrian
Blaaaaah
I have yet to see a firm date on the Denver Cup but will keep an eye out to see if the April dates reported by @Magic9 hold true.
They have held a Cannabis Cup around 4/20 in Denver since 2010 I believe. 2015 will most likely be no different. It's kind of the place to be.
It's good you are planning now, because trying to meet people at the largest cannabis event in the world is pretty damned hard to do. Especially when there is really no good place to sit/chill/sesh which has been the case the past few years IME. So many people, so very little space.
Not trying to harsh anyone's mellow just sharing some advice from past experiences.