Great, have fun at the info session. If there are some current students there you should try to meet them if you can.
For the interview, here are my tips:
1) schedule early. You can schedule before you turn in your application. I waited until after my application and they were booked solid. I had to keep calling back every few days to see if a spot opened up for me. I got lucky and got an open spot.
2) Try to interview on a Friday or Saturday so that you can also sit in on a class.
3) Wear a suit. Almost everyone else who interviews will wear a suit so just blend in and wear the suit.
4) There aren't any tough questions in the interview but be prepared to give a quick 5 minute background of walking through your resume and how the MBA fits into your future plans.
5) If they ask if you want to change jobs, think through your answer. An EMBA program isn't really for career changers (engineer wants to be an I-banker) so make sure that your expectations are accurate.
6) If you have any weaknesses in your application be prepared to talk about them (e.g. low GPA, low gmat score, gap is work experience, etc.).
7) Try to distinguish yourself from the pack. There are many other technology folks so try to think of something that sets you apart from the rest of them.
I think that's about all I can think of right now. Good luck and let me know if you have any other questions.
My Wharton Blog - http://www.whartonblog.com
Wharton MBA for Executives Ambassador - http://gmatclub.com/forum/128-t66295
My Story - http://gmatclub.com/forum/102-t49770