(Trent Nelson | The Salt Lake Tribune) An empty classroom at Glendale Middle School in Salt Lake City on Friday, Dec. 4, 2020.(Trent Nelson | The Salt Lake Tribune) An empty classroom at Glendale Middle School in Salt Lake City on Friday, Dec. 4, 2020.(Trent Nelson | The Salt Lake Tribune) An empty classroom at Glendale Middle School in Salt Lake City on Friday, Dec. 4, 2020.