You should still attend the fair! Go to learn more about what jobs are available and what employers are looking for in candidates. Use it as a networking opportunity for when you are actually looking for a job. You still need to do your research and be prepared. The difference is that your job is to gather career information, not get a job. Eavesdrop on the conversations between employers and students. Get an idea of how those conversations work. Use this opportunity to gather information and learn about the industry that you are interested in. Another option is to volunteer to help with the fair.