Goal.com has the venue listed as aami park which was taken from a season preview article posted by Melbourne city. I've heard rumours that the police won't let wun host either Melbourne city or victory at ironbark fields out of fears over a dangerous crowd. I doubt western united would bother moving the match to a bigger venue just to not sell any tickets though, if they knew they weren't gonna make any money on ticket sales they'd keep it at a venue that won't cost them anything to play at.