Celebrities and Knicks fans were on-hand for the Tribeca Film Festival premiere of “When the Garden Was Eden, a documentary directed by Michael Rapaport about the glory days of the New York Knicks. The timing of the film couldn’t be more fitting, albeit in a sadly ironic way: the Knicks just missed the playoffs and have fired their coach, Mike Woodson. But the team made headlines weeks ago by hiring former Knick Phil Jackson as Head of Basketball Operations, and Jackson was a power forward on those Knicks teams that won titles in 1972 and 1973.