STAMFORD, CONN. >> With the previews about to start, a trickle of masked moviegoers made their way into one of the first U.S. screenings of “Tenet” at the Bow Tie Majestic 6 in downtown Stamford, Connecticut. They took their seats Tuesday night, eyeing the empty seats between each other and a little giddy at being back at the movies for the first time in many months.