(Francisco Kjolseth | The Salt Lake Tribune) West High School seventh-grader Sadie Nelson-Stippich, 12, joins fellow students after walking out of classes in Salt Lake on Wednesday, March 14, 2018. Students around the country planned the large-scale coordinated demonstration to protest gun violence and memorialize victims of February’s mass shooting at Marjory Stoneman Douglas High School in Parkland, Fla.