Ok, so I'll be at the game but here's some data for review on Tuesday morning.
2015 ANZAC eve match - Friday - , Richmond 2 wins (let's face it, that's important) Channel 7 Melbourne viewers 380,000
2016 ANZAC eve match - Saturday - Richmond 1 win Channel 7 Melbourne viewers 297,000 viewers.
With Richmond undefeated an being a standalone match, this should be close to 400,000 on free to air tv. Being on 7mate, I'd be impressed to get to 250,000.