You can get to Newcastle most easily by train or plane, and the university’s campus is right in the city centre. The Percy Building (conference venue) on the university campus is in walking distance of the train station (around 20 minutes), or you can get the Metro to Haymarket station, which is right by campus. There are also lots of taxis at the station, if you prefer.
If you arrive by plane, you can also get the Metro direct to Haymarket.
If you need to book accommodation for your stay, any central hotel should be suitable as getting around the city centre is so straightforward. Search engines such as Trivago and Booking.com may be your best bet. Do contact the organisers if you would like advice on whether a particular location is suitable.