The Pittsburgh International Airport is 22 miles from Carnegie Mellon. The Pittsburgh Port Authority runs the convenient 28X bus route from the airport. The 28X departs every 30 minutes and the fare is $3.75. The route goes through downtown Pittsburgh past U Pitt, and stops in front of CMU. The trip takes about an hour. Take the bus to the last stop, Morewood and Forbes. CMU is across the street; you can't miss it.
The conference will take place in Room 103 of the Margaret Morrison building on Friday and in the Adamson Wing of Baker Hall on Saturday. A map of Carnegie Mellon's campus with these locations highlighted can be found here.