Esther had problems posting to this forum this week so here is her reply with some useful links:
Here a blog by Naysha, whose ceremonies I’ve attended and is very good, she is from Peru and travelling around the world to hold ceremonies:
https://naysha.blog/
Another blog by a knowledgeable lady:
https://www.afterlife.coach/after-life-blog
And a documentary about the Yawanawa people from Brazil who use ayahuasca in their traditions, the documentary does not really explain anything and doesn’t have a lot of text but it shows an ayahuasca (‘uni’) ceremony at some point :