School swimming competition day was the worst for me. No parents but multiple years all crowded around the swimming pool. You had to walk past all of your class mates in a swimming costume, jump or dive into the swimming pool and then swim x number of lengths.
Except that I am visually impaired, this was in the days when prescription swimming goggles were really expensive and my parents couldn't afford them and my teachers wouldn't let me wear an old pair of glasses for swimming lessons.
So I couldn't see my class mates, I would walk up the side of the swimming pool but I couldn't see where I was headed, I would jump into a pool I couldn't see and swim down until I finally could see the end.
I couldn't swim properly because when teachers had demonstrated the strokes I couldn't see them and at the end I couldn't see where the door to the girls changing room was, where the showers were or more importantly where my glasses were in my belongings.
Honestly compared to that sports day was a dream. I might not have been able to see where I was aiming the javelin at but so long as it went in generally the right direction it was fine.
So for me if sports day was removed, but swimming day remained then the only sports related competition would have been one I couldn't even see properly.
And yes you could remove swimming day but we had some excellent swimmers who deserved the opportunity to showcase their talent
I don't think sports day or other competitions should be removed, I do think the formats should be carefully considered with a mix of competitive and fun items and consideration given to those who may have physical limitations.
I don't think I've ever won anything at sports day but I know I quite enjoyed the ones at secondary school where there were a mix of events which you had to choose 3 to compete in, you moved around in groups and only a small amount of people were at each event at a time and it was very relaxed and chilled.