AFI DOCS runs June 14–18, 2017, in Washington, DC, and Silver Spring, MD http://www.afi.com/afidocs/features.aspx
I have not studied the program in depth, and none of the films that I screened made the festival, but, if you are interested in documentary film, I recommend you buy advance tickets to at least one film. If you do not buy tickets in advance, you will likely be relegated to the stand-by line, which is not as futile as it sounds. Most films screen once in DC and once in Silver Spring.
Here are a few films that did jump out at me:
I note that two films below appear to be showing only once (instead of twice) and also seem to be programed for the smallest theater in Silver Spring (theater 3). Seems like one of the high level programmers thought these were very important films, but not anticipated to appeal to a larger audience.
If you are a serious documentary film buff or an inspiring filmmaker, you may want to check out the AFI Docs Forum. In the past, it has only been for filmmakers and Industry people. You may want to look at the schedule of events. It does not include films (or food) only lectures. It seems like a good deal, although last year all of the forum sessions were streamed live.