Remember back at Comic-Con when we told you that August 21 would be Avatar Day, meaning James Cameron was screening 16 minutes of footage from his upcoming, much buzzed-about movie in IMAX theaters all across the world…for free? Well details regarding that special day have finally emerged, and The Hollywood Reporter tells us that tickets will be handed out on a first come, first served basis beginning this Monday, August 17 at noon PST (3pm EST) over at AvatarMovie.com.