Warning, I haven’t done a Seance since high school, but this is what I recall.
How to Seance:
Heavy velvet, satin or silk damaske curtains
Large heavy wooden table with long table cloth
Candelabras full of melty candles
A spiritualist medium, or short of that a Ouija board (of home construction is acceptable, I have drawn one out on paper and used an upturned (empty and dry) shot glass for a planchett)
A motley crew of friends, dolls or stuffed animals (toys or taxidermy, your choice).
Glasses of water or wine
Darken any electric or celestial lights
Deeply intoned calls to your dearly departed
Ta da Seance!