I once spent an interesting couple of weeks reading up on the subject, starting with LGAPs, Large Group Awareness Programs. Like Scientology, EST, and The Forum. They are all out to program you to get them money, yours or that from a new recruit. The point of first part of endless tedium of going over the contract is to put you into the susceptible zone. Then they keep you there, sequestered, for three days with just enough time away for sleep. I was even a guest at a new recruit meeting/demonstration. Afterwards I thanked the presenter for the entertainment, and he responded "then you'll never be a member" and walked off.
"Brainwashing" is an appropriate name for it. But getting into the zone IS relaxing.