I think there was a similar competition last year. If I remember correctly, whoever interested needs to submit a photo for the pre-qualification round. Then the organizer will select a group of participants. (abt 50-200??) On the actual day, all must report to the contest together, then the organizer will announce a theme for round 1, then all will set out to shoot with that same theme, then come back to print the image and submit the photos. Then organizer will announce the theme for round 2, and so on. The event would take a whole day.