"Participating schools" refers to the schools or educational institutions that are actively taking part or involved in a particular program, event, or activity. Full definition
The evaluation also used multiple methods to document how partnerships were developed and implemented in participating schools and Local Writing Project sites. (sri.com)
See a list of participating schools in the 2017 - 2018 school year. (unitedarts.org)
And the students at participating schools developed comparatively better interpersonal skills. (neatoday.org)