Matt, first preference would be a Sunday only race with a potential Saturday practice, but having a Saturday racing could also work. I would not advocate a 3 day weekend though as some of us will have only just returned form Barcelona.
I don't recommend two day aggregate race formats because they become problematic for people who only have availability one day.
Multiple races always give you a second, third, fourth chance if you have a problem or a bad run and more winners is always a good thing. Just my opinions.