But that's pretty much limited to coverage of the festival. Outside of that there's not much you can do. It's sort of the sound of one hand clapping. I think festivals can be even more important for documentaries. I think that other non-theatrical venues, like HBO, or Showtime, can be important for docs.
Documentaries are tough.
Even movies that win Oscars don't make a lot of money. It's a genre that seems to be out of favor with the American public. Your subject, your timeliness, are important, and hopefully a good movie is still a good movie, and will ultimately rise. Sundance is very important for docs. It's one of the few festivals where there's an out and out competition.