Can spectators stay with the competitors and share the food/lodging arrangements if they pay the entry fee?
Yes. We have always seen the competitions as a family event and therefore have always allowed people other than the competition participants to assist as helpers, trainers and so on. They only have to pay the participation fee too (food, lodging and so on, with same rights). So you could call the others in your party, coach, helper or some kind of official when you register. Our kayaking National Championships is held as a family gathering and kayaking feast. Of course we compete and shout after each other when the competitions is going on, but afterwards we are good friends again.