These days, you can watch television anywhere. On your TV, your tablet, your laptop, your phone. Even, at least in prepandemic times, at a movie theater. Recent editions of the world’s preeminent film festivals have showcased a wealth of small-screen programming on the big screen. SXSW, whose (virtual) 2021 edition starts March 16, has hosted world-premiere events for such buzzy series as “Dear White People,” “Search Party,” “Mr. Robot” and “Ramy.” Tribeca Film Festival, which has for years hosted screenings and talks with TV creators — including the world premieres of “...