U.S. gymnasts, left to right, Gabrielle Douglas, Aly Raisman, Simone Biles, Madison Kocian, and Lauren Hernandez pose for the camera at the end of the artistic gymnastics women's team final at the 2016 Summer Olympics in Rio de Janeiro, Brazil, Tuesday, Aug. 9, 2016. (AP Photo/Julio Cortez)

What to watch in primetime on NBC: Day 6

Some of the biggest American stars will be on display in primetime Thursday night on NBC at 8 p.m. ET/PT, from Michael Phelps and Ryan Locht…