If they give you any document, for example stating that you acknowledge that the carrying of an empty holster caused distress, take the document and say "I'm going to have my attorney look this over first", and put it in your pocket..
Second important point: starting now and for the next several weeks, do not have anything in your car, person, or backpack which could conceivably be called a weapon. No pocket knife, no pepper spray, no nothing. I would even park off campus and walk to campus, or have a friend drive me. Give no access to your vehicle which they could use to plant anything.
Third: if the school demands permission to search anything of yours (car, backpack, locker, whatever), say "I do not give consent to any search for any reason".
Fourth: Have a buddy outside the meeting place watching to see that you come out OK, and are not arrested at the meeting, and give instructions on what to do in that case.
OUTSTANDING advice!
Nice post, PapaBear.