I will be going out for a couple of hours and I might not make it back in time for the start of the tournament (I don't really have an idea of when I'll be back).
So if someone else with high enough authority, whether the person is listed as an organiser or some other staff or master (or Dragoon who seem to have helped with one tourney earlier), is there to take over at the time then don't hesitate.
You should use the Challonge website and post the image of the brackets here.