Kate Sheppard Cup and Chatham Cup finals are weekend of 6-7 September according to Capital Football - I imagine NZF had little to no choice for the international timing but still it's going to be a juggle to catch 'em all.
I was more thinking about the logistics for fans who want to attend the AW games but also one or both finals - e.g. if the Nix Reserves are out of the KSC by then I'll probably spend the weekend in Canberra to help justify the airfare before flying on to Auckland, but if they're in the final on Sunday 7th I'll have a dilemma on my hands.