Like "Lawrence of Arabia," "El Cid" is the kind of movie which if you haven't seen it on a movie screen, you haven't seen it. I'll be discussing why certain movies gain in power exponentially when the proportions are right, while others-- "TV movies" in my thinking-- gain scarcely at all when projected on a large screen.
This is why the plan is to either A.) show "El Cid" digitally at the WTC site on a large outdoor screen; B.) show it on film at a theater as close as possible to the site. Gaining permission for the first won't be easy. The second is very doable, but of course we'd need to drum up interest beforehand for the event to ensure a full theater, and proper impact from the event.
But think of it: The power of this movie when seen on a movie screen is unbelievable. The armies; the drums; the sound; the gorgeous canvas and music. It's an amazing experience. It's why I say that the Power of Art alone if well utilized can carry the day.