Job fest are a great opportunity for college students. They get to connect with various employers at once. Also, there is a lot of scope for networking with the people from industry. However, remember that you won't be the only candidate at the fest and there will be thousands of others like you. For you to get noticed and leave an impression on the recruiter's mind you'll have to stand out from the crowd. Which can be a little difficult if you end up going unprepared or without the major documentation to the fest. Employers often ask for on the spot interview and you need to ready for such situations.