I think some may be confusing two different schools.
1) Every 3 years or so, there is a 3-day school (Fri, Sat, Sun) conducted locally for elders (2 days, Fri & Sat) and ministerial servants (1 day, usually Sunday so elders can conduct Sun meeting). These are typically conducted on the circuit level using a local KH, or several circuits have met together at assembly halls
2) A Kingdom Ministry school for Presiding Overseers/Coordinators has been being conducted in Patterson for a few years now. The original goal was for all POs (no CoBE) to attend. I understand this was expanded with the goal for either all elders of the Service Committees to attend, and perhaps for ALL elders to eventually attend. This is for one full week (or perhaps it was even for 2 weeks originally). Seems like there was some talk of conducting at more locations now than just Patterson, such as regional Assembly Halls around the country (US), such as where they conduct Ministerial Training Schools. (I don't know if this has been implemented beyond the US at this time.)
My liberal elder friend who is usually open to discussing organizational "secrets" has already attended this school in Patterson, but he refuses to say almost anything about it. Just that it was incredibly encouraging and he doesn't understand why it isn't adapted to regular meetings for the entire cong to benefit. (Obviously, then there wouldn't be any "secrets" to make elders feel the power.) If anyone here (POs/CoBE) has attended this school, what's it about? What's the big secrets? (Maybe this could be a new thread if there are enough comments?)