Zhian'tara
The zhian'tara, also known as the Trill rite of closure, is a ritual in which a joined Trill meets with the previous hosts of their symbiont. 

During the rite, the personalities and memories of the previous hosts are telepathically transferred from the host to the bodies of voluntary friends by a . The former hosts' personalities assert themselves and the new host can converse and interact with them; this allows the new host to "meet" the other hosts who had been, until then, only memories and emotions. The objective is to allow the new host to understand more completely how the past hosts influence the new hosts. It is up to the volunteer friends to decide when to release the consciousnesses back to the original Trill.

Zhian'tara is considered so important a ceremony that the Symbiosis Commission requires it be performed and will go to some lengths to see it done. 

In 2371, Jadzia Dax went through the zhian'tara, using seven fellow Deep Space 9 personnel as host bodies for the Dax symbiont's former hosts' consciousnesses. ()

In 3190, Guardian Xi arrived on the  via hologram to perform an unjoining of Gray Tal from the Tal symbiont, to incorporate Gray's consciousness to a golem. Guardian Xi noted to Dr. Hugh Culber and Adira Tal that it was an atypical arrangement, for an "zhian'tara unlike any other." After Xi conducted the ritual, he noted he was not yet able to sense Gray's presence in Gray's new body. Also, Guardian Xi is only present as a hologram when he performs the ritual, hinting at the fact it is primarily the symbiont who is responsible for the transfer while the Guardians perform only a ritual function during the zhian'tara and Xi might not have ment it literally when he spoke of not "sensing" a presence. ()

External link
 
de:Zhian'tara
pl:Zhian'tara
Ceremonies