Okay, have to have a semi-rant: Not that anyone tries to find anything wrong with personality and attitude, but I mean at some point in education you get to where everyone next to you is just as qualified, has just a good a GPA, just as good experience, just as good involvement etc. etc. so you can't expect to get the interview or job solely based on that.
Now I'm not saying OP did something wrong or has a bad personality or anything, but it just comes down to how you sell your skills and how you connect with the recruiters & staff. You can't count on just your credentials.
I interviewed on campus with a partner from Moss Adams a year ago, didn't get a 2nd call, didn't email anyone from that firm since.. A whole year, no contact at all, and this year I applied, got another interview, happened to be same guy and he remembered me (and got an office interview this time). So yes, I think it's possible that they remember you from an event, no matter how many applicants they saw. Just comes down to connecting and making an impression. Is it possible to have a great attitude, great credentials, and still not stand out? Absolutely.
To OP: continue to apply and get help from the career center at your school. There's likely counselors that do mock interviews and could provide good feedback on what to improve. Don't get discouraged and just commit to continued improvement. No matter what you have going for you (and your credentials are impressive, by the way) keep working like everyone else is more qualified. At the end of the day, it's a competitive job market and you got to stand out among a group of well qualified professionals. Stay motivated, and keep improving.
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