I don't see any problem with attending. You aren't communing with them or anything, just meeting, talking, etc. I don't see an issue with you as an inquirer (or even as an Orthodox layman) participating in such things. Personally, I was always uncomfortable in this kind of setting, even as a Protestant, and becoming Orthodox intensified that for me. But, again, just my own personal attitude towards such things...but I wouldn't condemn anyone else for being involved.