All the shows I have been to around here, the guys carrying clipboards are the judges. As far as how many guys, I have had as many as 10 guys judging and as little as 1 guy. All depends on the show. For safety equipment, the shows around here will advertise on their website stating if it is required. I car an extinguisher at all times, so I don't worry about it to much. As far as classes, most shows around here do top so many cars get trophies and everyone is grouped together, doesn't matter stock or modified.