I think the best thing to do is keep AA games on Saturdays, and leave it up to independent organizers to choose the game date.
Like Mike and Meanguy said, there are already games that go down on Sundays.
When it warms up a bit, there will probably be games on both days, every weekend. When I was new, I had games all both days, almost every weekdn at BT. Those were some of the games where 5 guys would show, but we'd play anyway.