I went once in hunt valley, md. Early 70’s. I was invited by a young lady.
They told me it was $600 bucks for the course and I couldn’t use the bathroom during the sessions. Erhard Sensory Training as I recall.
Buckminster Fuller if I remember correctly. They lost me at $600. I remember leaving and going to a bar on York Rd.
That was a hell of a lot of money back then!