Open meetings are designed for people who want to sit in and listen. When people go to an open meeting it is usually to decide if they are an alcoholic/drug addict. I can remember being in the same situation as you when completing my college diploma. However, I walked in and knew that I was dealing with addiction issues - so I was one of them - but I didn't go to meetings. I wish you luck pal - don't expect a warm welcome - and sure as hell don't throw around "textbook quotes" pertaining to addiction - cause you'll get eaten alive! (Take it from someone who has been there!) Do you know someone in the program who could accompany you?
Good luck!