Very classy. Like it a lot. I'm not so sure about a qr code either. Nobody around me ever uses them nor have I seen them on anything lately. I think it was something that never caught on. I could be wrong though.
The only thing is the shirt. I take it you are a mentalist? Somehow the unbuttoned shirt looks a bit too casual. I really don't know enough about style to give you a specific reason for this. My "gut" tells me that if I were a college kid looking at that I would be less likely to attend because you look too much like me(not me specifically...meaning you look too much like another college student.)
I would recommend doing some work on the photo though. Right now it looks like you took it straight off the camera. Because the photo is a focal point, the entire poster could benefit quite a bit by touching it up to add some drama and intrigue. Here's an example of how simple the changes can be yet provide drastic results:
Plus, it's an excuse to look at Megan Fox. Win - Win.
Either way, have an amazing time at the show and I hope it's a massive success. You should invite Megan Fox.
I prefer the first poster over the second, but my one recommendation, which is hearty, is to darken your face a bit.
No joke, when I first clicked that link, it took a second to load and when it did, I jumped a little. Your face is so bright in it, and it's so central, that it's jarring. The rest of the information was lost because I was so focused on your face glaring out at me. Take out some of the brightness and that will lessen. Also, when I asked my girlfriend sitting right next to me, she said, "looks like a prison photo."
So try to take some of the brightness off the face and I think it looks good.
Poster looks, great. Good typography. Only problem I have with the poster is the photo itself. Not sure if you attempted to darken underneath the eyes, but that could use some work. Having done some photoshop, I do know that getting it the right color can get tricky. Another thing I think you can fix if you have time is the dress shirt. I'm not trying to be picky, but the fact that your left collar is not even close to being symmetrical is a bit annoying. I'm sure that the average person walking but wouldn't notice nor care about it and not fixing it wont change their mind as to if they are planning to come or not, but you asked for suggestions and there you have it. Good luck in the show.
The reason the skin under the eyes is lighter is because I have a tan line from wearing goggles during swim practice... And I guess I could go back and take a better symmetrical picture, but I'm not too worried about it.. I'm more worried about trying to photoshop my goggletan out.