I can't imagine the academic kids and their parents being too happy if we dismissed their achievements because not everyone is as clever so it shouldn't count.
But when was the last time your school held an academic competition with questions in front of the whole school and parents, where everyone got to see kids give wrong answers and kids were ranked for Maths and English from best to worst? It doesn’t happen.
Schools giving out certificates in assembly for academic achievement to a few kids isn’t the same as it doesn’t order kids from best to worst like a running race does.
Im not even against sports day, one of my kids quite liked it at primary school, but I just wanted to say that your argument makes no sense.
Good schools recognise improvement and effort in all lessons, so if your school doesn’t do that, and only usually recognises kids that are clever, then complain.
Sports days at secondary schools here are optional which I think is best. Let the sporty kids and those that may not be that sporty but want to do it, do it, and let the others cheer them on. It works well at my daughters school.
I don’t know why people get so bothered though, when one of kids didn’t want to do sports day at primary, I just gave them the day off, no drama.