For the events with a qualification round we have a fixed # of competitors for the first round. For 3x3 that is 200 competitors.
To get from qualification round to first round you have to be among the top x competitors. With x being the fixed # minus the # of competitors already in first round.
In general people registered after (I think it was) May 15 are in qualification round for 3x3, 3x3oh, 3x3bf, 4x4 and 5x5. Unless they are in top 50 of WCA ranking for the event.
We need to come up with something better for future competitions. The # of registrations was just bigger than we expected. Also, the number of events per competitor was bigger than we expected. That is why we need to use Friday too.