You can end up spending $1000 US on a travel package to the cannabis cup. If you just want to be in Amsterdam during the cannabis cup you would find a hotel as you normally would, and if you are on a budget you could stay in a hostel for next to nothing.

I have never been there, I know that some people are dubbed "judges" and some are not, and I think then a celebrity panel decides the winner, but they just try the favorites.

A few people from Amsterdam post on here, I'm sure they could let you know exactly how it works.