If you are soldiering on instead of bowing out, here is a suggestion that I have used.
Warning: Absolutely no RHS rules are involved! BY DESIGN!!!
Every adult and child that attends gets a sheet of paper (if they want to be a "judge"). It is divided into squares, one for each category being judged, category name at the top of the square. Each square has three lines under it. You can write any three entrants in the category on those lines, as long as you write each entrant only once. Each line is weighted equally, no first - second - third.
If a "judge" wants to only vote for pumpkins entered by relatives or close friends, fine. If your criteria for selecting onions is how close the color is to your favorite hamster, no problem. If you want to judge beetroot using RHS standards, no problem.
I used this method when Cub Scout pinewood derby cars were being judged on appearance, rather than speed. Parents could not complain about unfair judging, because everyone was a potential judge! I literally had not one complaint after.
The added benefit is that if the Chair and besty want a knock-off imitating RHS judging, they will not get it, and they will never ask you again to organize this event. The best reward of all.