On 3, I've read about certain American groups that have a history of psychedelic use, holding confessional sessions on their hike to the trip location. This was a chance to clear the air and remove concerns from the users mind that might play on them while in the trip.

Interestingly, due to the low doses many groups take they take these after encouraging a period of fasting and speed deprivation.

Anyway, outside of my area of expertise but something I consider interesting.