Slaughtering in the name of a buzurg

Q: I live in Jammu and Kashmir India. Here we have a tradition that whenever anyone is ill or has some problem or on the occasion of joy, the people make qurbani (zabiha) of a goat or sheep or any other halal animal and take that to a shrine (a sufi buzurg’s grave) and distribute it among people. However the slaughtering is done according to shariah in the name of the so and so sufi buzarg.

  1. Is it permissible?
  2. If yes, is it halal for everyone? Can everyone eat it?