I've had some email requests on how the AKR seminar was structured.
There were a total of 135 participants. The first day was open to yondan and above, then they all stayed for the next three days which were open to all ranks. So yondan and up got a 4 day seminar while everyone else got a 3 day seminar. Three instructors were sent from Japan and they taught and judged all four days.
The seminars are slowly getting more expensive every year but so far no seminar has ever been canceled but if prices continue to rise that could certainly happen at some point.