I found this while going down the Google rabbit hole. Thought others here may find it interesting.

http://www.destinationayahuasca.com/

Also in Peru ther is an ayahuasca retreat, They have times that are of 7, 10, or 14 days duration click link for calander and more info.
Yes we can do it in the safety of out own home but IMO I think the experiance would be so much greater with a ceramonial based genuine shaman and its natural surroundings.
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http://www.biopark.org/peru/schedule.html

Theres a doco about an aya retreat in the Amazon called Metamorphosis. The retreat I believe is called "Blue Morpho". Worth checking out for sure.

Blue Morpho is one of the more well-known retreats, but that does not mean it is the best, indeed it seems for every satisfied person there is another who finds them overpriced and watered-down for gringo consumption...

http://www.mishkitaki.org/main/?page_id=41 offers a good list of aya retreats in South America

Personally I woud rather experience A in my own home with my very small and secretive clan of explorer friends. Seems too commercialized and expensive to travel that far.

From what I understand though the true shaman led event is quite interesting and purposeful. Funny tho, Terence M. talks about offereing one the purified spice but after describing the experience the shaman declines politely.