Yep, what Richard said!
A NADAC Hosted Trial is completely taken care of by us. We do the pre-trial stuff (premium, entries, building deposits, etc), bring in judges or judge ourselves, and do all of the secretarying. We CAN bring in a equipment depending on the situation, but if there is equipment on site, we usually rent it.
If you are wanting to hold your own trials, you will need to go through the steps to become a club and then follow the secretaries handbook (on the website) to prepare and host a trial.