I can't remember the attendances on ANZAC day for the past few years, but should make interesting reading, in particular Central v Norwood a few years back and Norwood v Port, not so long ago.
The following are the Anzac Day crowds for the years 2011-2015
2011 Central District vs Norwood - Adelaide Oval 6,358
2012 Woodville West Torrens vs Central District - Woodville Oval 4,054
2013 Norwood vs West Adelaide - Norwood Oval 6,038
2014 Norwood vs North Adelaide - Adelaide Oval 10,014
2015 Port Adelaide vs Norwood - Adelaide Oval 5,526
NB The Port vs Norwood game was played at 7:10 p.m. on Friday, April 24th
I don't have the crowd for this year, but I believe that the two Grand Finalists have earned the right to play at Adelaide Oval on Anzac Day.
One of the biggest mistakes I think the league made was when they took that right away from the two Grand Finalists in 1986 and played Port and Norwood instead. It took about 8 or 9 years to get the tradition back. How can clubs with lesser supporter bases develop support if they aren't given the premium dates if they have earned them.