Sabino High School sophomore Madison Mariani has been invited to be part of USA Gymnastics’ Kellogg’s Tour of Champions that features Rio Olympics medalists Simone Biles and Gabby Douglas. Mariani, who has accepted a scholarship to Michigan, will perform at Glendale’s Gila River Arena Thursday night as the Olympians make one of their 36-city stops in Glendale. She then plans to make a visit to her future school to watch the Michigan-Wisconsin football game on October 1.