Conversation so far:
What is the legacy of Harry Nilsson?
Harry Nilsson is the subject of a 2006 documentary, Who Is Harry Nilsson? produced by David Leaf and John Schienfeld.
What happened with Harry Nilsson's film, Who Is Harry Nilsson (And Why Is Everybody Talkin' About Him)?
The film Who Is Harry Nilsson (And Why Is Everybody Talkin' About Him)? was screened in 2006 at the Seattle International Film Festival and the Santa Barbara International Film Festival.

Question: When did it go to theaters?
Self-contained rewrite: When did Harry Nilsson's film, Who Is Harry Nilsson (And Why Is Everybody Talkin' About Him) go to theaters?