The Boston City League is like a big group of schools in Boston that play sports against each other. Just like how you play games with your friends at school, these schools play games against each other in things like basketball, soccer, and football. They have special rules they follow to keep everyone safe and fair.
It's kind of like a big sports club where schools can join in and have fun playing with each other. This way, they can have friendly competitions and improve their skills while also making new friends from other schools. Sometimes, they even have big championships where the best teams compete against each other to see who will win the big trophy.
Overall, the Boston City League is a way for schools in Boston to come together and enjoy playing sports together in a safe and friendly environment.