I think enterprising students who are interested in self protection get holsters with a reasonable facsimile of a firearm, (toy, airsoft, etc) and then conceal them on their persons for a couple weeks while documenting the same on video.
After the two weeks is up, release the videos to the administrators at the college and say, “ See, we were carrying fake guns concealed and you NEVER EVEN KNEW. So how would it be different if we were carrying the real deal? The biggest difference would be that we would have a much better chance of ending the violence of an active shooter.”
That is an interesting idea but I would be worried about possible academic retaliation against the students. Perhaps it would be better if the peson were a visitor attending an on-campus event.