Doctor Who Festival in November. Gomez and Oliver, who play Missy and Osgood respectively, will join Peter Capaldi on the panel at the event, which runs from 13th - 15th November.
Photo opportunities with the stars will be available from 10am on Wednesday 15th July. Photo opportunities are available only to ticket holders, who can also choose to have a photo on a set from Series 9. With the overwhelming popularity of the festival, tickets are likely to sell out fast, so make sure you set a reminder to book yours!
Further details about the festival and additions to the line up of guest stars will be announced nearer the event.