Do you have any more specific of questions? I'm not sure how to narrow it all down into one description.
Most of the time is spent waiting for your breed to be called. This time is often spent browsing the show room, vendors (if the show has any), helping out the show staff, or talking with friends (a nice time to meet up with all the rabbit loving friends that we rarely see outside of shows). Once the breed is called, the rabbits are brought to the judge's table and left in show cages. The owners stand back and quietly watch while the judge handles the rabbits and gives placements and his/her reasoning for those placements (ie what the rabbit's strengths and weaknesses are, information that can be used to help pick out future stock/breedings). It's supposed to be rather anonymous - the judge isn't supposed to know who owns which rabbit.