Not sure if this is a thing, so here goes.
I have been helping my local gardeners club with web site hosting and they have the results from the produce show in an ugly excel workbook.
Does something exist that would allow setting up the show classes and then logging the points a entrant gets in each class?
https://www.melkshamgardenerssociety.co.uk/flower-produce-show/2024
If you don’t want to code the score board yourself then I think you will get more recommendations if you mention what framework you use to build the site and maybe an example of how you want the presentation of the scores to look.
A quick search tells me that https://wordpress.org/plugins/visualizer/ has manual data entry so it might be a fit if you use wordpress and I imagine you can find similar things for Drupal, Joomla or whatever you’re using.