The convention center is huge! We went for PaxUnpl...

The convention center is huge! We went for PaxUnplugged and only saw maybe half of the building. The exhibition hall was well lit and well ventilated. The bathrooms are clean enough. One downside was that they limited the entrances you could use. So despite it being cold at night we had to walk the length of the building to get in because a guard at the door told us we couldn't use the closer door.