First Ever Network Broadcast in 3D. Super Bowl XXIII Halftime Show 1989

From wiki: The halftime show was titled "Be Bop Bamboozled in 3-D" and featured Elvis Presto, played by then-Solid Gold dancer Alex Cole, and hundreds of South Florida-area dancers and performers. Several scenes included computer generated 3-D images. Prior to the game, Coca-Cola distributed 3-D glasses at retailers for viewers to use. At the onset of the halftime show, primary sponsor Diet Coke aired the first commercial in 3-D.