* Formal: The interschool debate competition was fiercely contested, with teams from all over the region participating.
* Informal: We had an interschool soccer tournament last weekend, and our team won!
* Descriptive: The interschool music festival was a vibrant celebration of talent, featuring performances from various schools in the district.
* Specific: The interschool track and field meet will be held at the city stadium on Saturday.
Remember, "interschool" generally refers to events or activities that involve multiple schools.