You’re not going to the stadium or anywhere near it. Also, the Eagles are playing on Monday night that week, so there won’t even be a game happening during PAX.
The people of Philadelphia are indeed a violent people, whose lives are brutish, angry, and often short. They will typically confine their aggression to shouting (at eachother or at nothing), loudly being bothersome, and drunkenly annoying strangers while attempting to drunkenly hire Lyfts.
However, when enraged by the act of preparing to watch, or god forbid actually watching, a contest of sport, they become dangerously violent, attacking anyone who catches their attention or displays the paraphernalia of another city with the hatred of a people who have so little else to live for.
So you’ll be fine so long as their is not in fact a contest of football at the time and place of PAX.