I have to respectfully disagree with all 6 at the same location. Aside from the field conditions discussed, exactly what would the schedule be? No matter what you do, some teams/classification will be effected.
I have heard the gripe about time in between games being too long. Maybe for fans waiting yes, but more goes into it than that. You have after game trophies, then the teams warm up.
Without naming a specific location, 3 different seems the way to go to me. I have heard the play 3 Friday, 3 Saturday. Well honestly I think that really tells the ones who are playing Friday they aren't as important. The entire team then misses school, and some of fans and parents will miss because they are working. 3 Saturday and 3 Sunday. Then instead of school and work, they are missing church. To me, it just seems like half are somewhat "punished". And when I have seen this idea in the past it has always been then small schools play Friday. The way that LOOKS is they aren't as important and that it depends on where you live and how many kids you have as to how important you are