Pontio is on Deniol Road in Bangor, post code LL57 2TQ. The conference will be in room PL5 on the fifth floor (there will be signs to direct you there).
The centre does not have a car park but there are a number of car parks nearby, including the Glanrafon car park which is directly opposite. A map of the car parks and their prices is available in this article by the Daily Post – http://www.dailypost.co.uk/whats-on/arts-culture-news/can-park-pontio-10413393