Will the campus information conference recruit junior interns?

No recruitment, campus recruitment is only open to fresh graduates. Juniors can go to internships at companies you want to work for in the future, and you will have more advantages when you graduate. And when you are looking for an internship in your junior year, they hope to train you into a reserve cadre, etc., and hire you directly after you graduate. For example, KPMG, PricewaterhouseCoopers, etc. seem to be recruiting junior interns.