Not much to tell you probably don't know already. Stay off school grounds & out of government buildings. Don't act nervous and more than likely nobody will react to you carrying. I haven't been down to Purdue for a good number of years, so I don't know where the bad parts are, if any.
In a turnabout, I'm going to be traveling to the Pittsburgh area in a week, for a week. Tempted to bring my firearm along with, I just wouldn't feel right without it. How is the Monroeville area?