AOTW, you are merely guessing. In fact the organisers had a great handle on the event. A NOTAM was applied for to list the ALA and fly in. It was requested that the NOTAM nominate 126.7. The NOTAM was raised but CASA refused to list 126.7 as the preferred frequency on the NOTAM or agree that its use would be prudent.
While it was tempting for the organisers to use 120.7 and thus block ATC transmissions at YDPO and further afield all day , it was decided to use 126.7 regardless which was technically illegal and contrary to what CASA suggested. Unfortunately this lead to aircraft arriving on both frequencies because it was impossible to anticipate just who was coming and get the news to everybody. If there had been an incident, I am sure some awkward questions would have been asked
If you call that a satisfactory outcome, I would tend to disagree with you.
BTW around 50 aircraft flew in and the organisation was impeccable.