I agree 100% with Dave. First and foremost it's a show for the spectators. I think it's a great showcase for our sport by having the best Masters Men skiers in the world go head to head at night under the lights. It's one of the most exciting formats the sport of waterskiing has seen in a long, long time. I think we all also understand that skiing at night, while very entertaining, presents challenges in both skiing and officiating that doesn't exist during the day. Stadium lights surrounded by darkness, water, and lighted buoys looks great from the spectators point of view, but we know the lighting has to have a negative effect on the spatial awareness and vision of the skier, and also certainly has to affect the judges ability to clearly see if a skier misses a ball. (I sat directly underneath the judges stand by the announcers booth and commented that there was no way the judges could clearly see the skier going around the balls in the far side of the course).
Given the skiers and judges limitations during nighttime events, I don't think it's reasonable to consider trying to run it as a R Class.
So, if we recognize that there are limitations in running this type of event and focus more on the entertainment value of great head to head matchups at a world class venue at night with stadium lights rules can be written (or even unwritten but still understood) that address potential problems and issues that typically don't exist during tournaments run in the day.
Personally, I think there will be a high likelihood of distractions when running a tournament at night. Cars with headlights on or cameras that flash as skiers are in their run will typically happen. It's will also have a negative impact for the skier, but I don't think it's realistic to mandate no external light sources. Light flashes from external sources are very likely to happen. It should be written or unwritten that skier should deal with it the best they can, because they won't be granted a re-ride for getting distracted by light.