Regarding A7X exiting the soundwave festival, seems like Avenged Sevenfold were being a total pain in the ass.
For those who don't know, soundwave is a huge metal festival that tours Australia, here's the website where you can view the lineup
https://www.soundwavefestival.com/This is from the soundwave organiser's twitter:
"Avenged have decided, despite having originally confirmed a mid afternoon spot, that they are now unwilling to play unless it is night time. At the same time, they are refusing to play at the same time as Maiden. Which leads me to believe they want Maiden's time moved! While Avenged are a massive band, having sold around 8,000 copies of their new album Nationally, I wont be able to move Maiden's time slot. I have now reached the point where I can no longer mess around 70 other bands and 180,000 ticket holders to appease this band's nonsense. I have every expectation that they will go back on their agreement and cancel. I guess I'd better start lining up a replacement. Let's have your ideas people!"
So, the festival goes from 12pm to 10pm and Avenged wanted to play in the dark but did not want to clash with Iron Maiden who were headlining the gig fro 8pm to 10pm. It gets dark here at around 8pm during summer. I don't know if they were purposely screwing them around because they knew they weren't going to do the show.