The way I see it, we have all day, so time isn't really going to be an issue, especially with how many setups we're likely to have. I'm expecting a turnout of around 30 people or so (based on a completely random guess I just made up) so time really shouldn't be a problem.I perfer round robin because you'll get more matches, but I'm guessing there's gonna be too many people for it. Plus, if it's split between two floors, finding opponents is even harder. More time will be wasted...
Your call BigC.
I really don't care either way though. As long as I can get in a good amount of matches, I'll be happy.