Unfortunately, the event has already sold out but, for those lucky enough to be attending, they will have the opportunity to watch "The Magician's Apprentice" three weeks before the rest of us!
According to the press release for the event (which can be found below), the run time for the episode is a normal forty-five minutes, as opposed to last year's eighty-minute feature-length premiere, "Deep Breath."
The Magician's Apprentice27th August 2015, 8:30pmStarring Peter Capaldi, Jenna Coleman, Michelle GomezDirected by Hettie Macdonald, 45 minutesExploding with epic and thrilling adventures, don't miss the opportunity to see the opening episode of BBC One's new Doctor Who series 'The Magician's Apprentice', written by Steven Moffat, produced by Peter Bennett and directed by Hettie Macdonald.The screening will be followed by a Q&A with guests to be announced later.
Series nine premieres with "The Magician's Apprentice" on Saturday, 19 September.
[Source: Doctor Who News]