Fans liken the move to Dementors sucking the joy out of homegrown fun PHILADELPHIA: Warner Bros. is cracking down on local Harry Potter fan festivals around the US, saying it’s necessary to halt unauthorized commercial activity. Fans, however, liken the move to Dementors sucking the joy out of homegrown fun, while festival directors say they’ll transfigure the events into generic celebrations of magic. “It’s almost as if Warner Bros. has been taken over by Voldemort, trying to use dark magic to destroy the light of a little town,” said Sarah Jo Tucker, a 21-year-old junior at Chestnut Hill College, which hosts a Quidditch tournament that coincides with the annual suburban Philadelphia festival. Philip Dawson, Chestnut Hill’s business district director, said Warner Bros. reached out to his group in May, letting them know new guidelines prohibit festivals’ use of any names, places or objects from the series.