I would seriously reconsider keeping firearms or other obvious weapons in a dorm room. The BEST bad thing that can happen is that someone sees it and reports you - how would "expelled for weapons" look on your transcript? The worst is that that drunken roommate of yours finds it and... (add whatever stupid, tragic event you want here).
This is where you seriously weigh the probabilities of needing a 'weapon'. As I see it, that probability is statistically insignificant. Most college campuses are safe places, and the inadvertent discovery of an illicit or illegal device is not worth the risk.
In event of a major incident, the school will probably be shut down, so your preps should include "get-out-of-Dodge" money and a way of calling home. Friends who live off campus, or profs you know well, are also an asset. It also helps to be on friendly terms with the Campus Cops - "Hey, can I wait here......?" Likewise, having a favorite off-campus restaurant, drug store, tobacco shop, etc. that you frequent and are known at will be to your benefit. "Hey, can I wait here......?" You should strive to be more than a nameless, faceless 'student' and build ties within the local community.
If the school is shut down, you will have a limited time to clear out - it will be grab-and-run at the dorms, so having such things as climate suitable clothing, comfortable footwear and toiletries ready to go will be to your advantage. Expect traffic tie-ups, both on-campus or in the vicinity of the school. If you are going to have someone come and get you, it is best to meet at a well-known location at least a mile from school. If you are on foot, you may be stopped and interviewed by the cops or have to pass through checkpoints. This is where it is good to know your local LEs, and not have any obvious weapons. Cooperate with them - things are jumpy enough as it is, don't add to it. Keep your mouth shut, your opinions to yourself and strive to be as gray as possible.
Now I admit that my experience in on-campus disasters is limited; I was only involved in one - Kent State, May 4, 1970 - but I find it hard to envision a more difficult situation.
soupbone