Sure they can. Coliseum, athletic dept gyms, student recreational facilities, classrooms with chairs pushed into the corner. Numerous local school buildings and govt buildings in the capital, too. Expensive, looting problems, but in a once in a lifetime emergency that can be dealt with. We have in the past.
You're going to house 50,000 to 100,000 people at LSU by stacking them up in classrooms with chairs pushed in the corners?