The event is being held in various buildings at Sheffield Hallam University's City Campus. This is close to Sheffield train station, the main bus interchange and the city centre. If you are using GPS, the postcode for the campus is S1 1WB.
When approaching the campus from the train station, you will see a pedestrian crossing to the right of the fountain/waterfall wall outside the station. Cross here and go up the ramp to your right, walk between the buildings and head towards the main building. This will lead you to the central Atrium.
Alternatively, if you enter through the main entrance you will be on floor 5 of the Owen building. Walking straight ahead will lead you to the central Atrium. You can either take the lift or the stairs to level 2 to get to the ground floor.