Day For Night challenges the festival industry to accept something it should have awhile back: We live in a digital world, one where musicians and visual artists are much more comfortable than the people renting the stages and signing the checks. In its second year, Day For Night will expand both its location — Post HTX, the former Barbara Jordan downtown post office, offers 16 acres of performance space, both indoors and out — and its lineup, promising an immersive multimedia experience that will leave fans’ mouths agape. But even if this were “just” a music festival, Day For Night’s talent alone would make it spectacular: Aphex Twin, in his first U.S. performance in nearly a decade, plus ODESZA; Kaskade; Nick Murphy (Chet Faker); Butthole Surfers; Travis Scott; and Run the Jewels — and that’s just to start with. Add the contributions of visual artists such as Björk Digital (the über-quirky Icelandic polymath who will also do a music set and DJ at Friday night’s pre-party), United Visual Artists, Golan Levin, NONOTAK and Damien Echols, among others, and Day For Night is, in two words, utterly unique. Ticket availability is dwindling quickly, but in this business there’s always a way in with the proper connections.