I don't remember seeing any non-students doing daygame on campus when I was in undergrad or in grad school during the 2000s.
Is there any difference between doing an approach session at a college campus as a non-student vs. taking time out of your day to do approach sessions at a park, busy foot traffic area on the street, walking/hiking path, or any indoor retail location (malls, grocery stores, etc.)?
Doing approaches at bars that are mainly college bars (near a university) is different than doing approaches on campus on a weekday afternoon.