The District is an important destination to see the work of the artist Nam June Paik, who spent much of his career considering the television. Not only does the Smithsonian American Art Museum boast two big-time Paik installations—“Electronic Superhighway,” a phrase that Paik coined, as well as “Megatron/Matrix”—it also employs senior media curator John Hanhardt, who has put together “Nam June Paik: Global Visionary,” a retrospective on the artist’s influential career. Hanhardt’s multipart lecture series on the history of the television in contemporary art, which looks at Paik, is a revelation; no doubt a full look at Paik’s major works, as well as his writings, collaborations, and performances, will be must-see TV.