You can spot captured rites before performance drops: the same safe topics keep getting airtime, one small group explains what the ritual “really means,” and the ceremony gets longer every quarter.
That is not discipline. It is agenda control, interpretive monopoly, and ritual inflation. The rite has stopped serving the work and started protecting its stewards.
A better structure is blunt: the people with the most downside should set the heat. Once a quarter, put the ritual itself on trial. The operator who owns the outcome names the uncomfortable topic. If there are several, pick one at random. The facilitator gets no veto and speaks last. If the ritual now needs a glossary, cut it back.
Do not use this in a low-trust, punitive culture. You will get a show trial, not a correction. But if your postmortems are polished and strangely harmless, run it now. Agenda control is usually the first sign that the rite has already been captured.