"Obviously, there are managers and coaches, but when I was walking around the park I talked to a lot of people who had travelled to watch their children or grandchildren play."
High School finished ninth overall, just out of playoff contention, and Collegiate came in 13th, with High School winning the local derby 2-0.
"High School had beaten them in the interschool competition that ran prior to the tournament," Campbell said.
"Collegiate was hoping to get one up on them after that, but it didn't quite happen."
Despite the loss, Collegiate had a massive improvement from its showing at the last Trident tournament, in 2019, Campbell said.
"They finished in 21st place then, so it was a massive jump this year."
The competition was won by Havelock North High School, who overcame Onslow College in the final.