Previously we were told it was 6 eggs. This picture clearly shows at least 10.
From the video it looks like someone must have dropped them from on top of the stadium. They all came straight down and hit the stage at the same time. That’s impossible to do if you’re in the audience. You would need a few people, with perfect aim, and with perfect timing who can throw extremely high.
Most likely the eggs were dropped from the riggings on top of the arena. This is an area which only workers have access to:
The people responsible for this shenanigan likely worked for the Acer Arena in Sydney, Australia.