This screening is part of the Scalarama season which runs throughout September. Full details here.
Here is the Horse Hospital introduction:
Hallucinatory satanists infest swinging London in this hard-to-find psychedelic Giallo from one of its boldest proponents, Sergio Martino (The Strange Vice of Mrs Wardh, Torso, Your Vice is a Locked Room and Only I have the Key). All the necessary ingredients are here, including giallo queen Edwige Fenech as the troubled victim of a psychopathic stalker, exotic West London locations and a psyched-out sitar heavy theme from Bruno Nicolai.
Here (and above) is the trailer.