I have never been in a guild nor been to any meetings as a guest but I also am not shy. However, whenever I do talk to someone that appears to be stuffie and cold I just say to myself "move on; it will be better elsewhere" as my positive thought to myself and usually that is the case.
I would go one more time and see if things are different. If not than move on to another guild or either just go on to classes and participate and see who comes to you. They can't be cold forever.