I got to see about ten documentaries combined at this year's and last year's Tribeca Film Festival. The one that I loved the most was Night School from 2016. I kept checking for release dates or the trailer, at least, but nothing was announced until recently - the film finally got purchased by a distributor and is now available for streaming.
So many documentaries at Tribeca are about famous or somewhat famous subjects and are so full of egos. This one, however, is such an honest and humble movie without any pretense. Highly recommended!