Meanings of dark seance in English

I'll stand for most any kind of a dark seance, but this particular spook business is getting on my nerves.

They still concluded their performances with a dark seance, for an extra charge, in which both young men were tied to their chairs.

Addison and a long-legged friend took front row seats, and during the dark seance the two men extended their legs, stretching as far as possible.

The gentleman whom I have mentioned attended one of these dark seances.

This interest the believers continued to receive at dark seances from the spirits for a time.