Meeting to contact spirits (6)
I believe the answer is:
seance
'meeting to contact spirits' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for seance that I've seen before include "Medium's session" , "Some may arrive late to this meeting" , "Meeting for communicating with spirits" , "Spiritualist meeting presided over by medium" , "Psychic gathering" .)