The program at King College Prep High School included lectures and workshops.
The union claims school closings, consolidations, and turnarounds don't work, disrupt neighborhoods, and endanger students sent to unfamiliar, unsafe areas.
"The worst case scenario is that we have students who suffer from the violence that these kinds of closures get us," CTU President Karen Lewis said. "But the second thing is that our students suffer from the fact that they're not getting the appropriate education at the next place anyway. And then the third thing is the dislocation of the community
Education officials say schools that will close are under-performing, and students who now go there will attend higher-achieving schools.