From my experience, at Cons that go from Friday-Sunday most the stuff is winding down on Sunday since it's the last day. But Kumoricon closes on Monday, so it seems like Sunday might be one of the busier days since it's the middle day of the con. The middle day seems to be the busiest at most of the cons I've heard of... Granted, I'm going off what I've heard, not experience since I've only gone to SakuraCon before, so I could be completely off on this...