It is safe to assume that the regular prayer meetings, organised by our parishes, under the leadership of our priests, are sponsored by the Orthodox Church. But it is not only to these meetings that our members go.
When I was in college, I participated sometimes in a Men's Bible Study sponsored by the Indian Christian group on campus. Usually, the subject of the study was something fairly innocent (e.g., the life of David as a model for Christian men). If, however, a topic came up, and the Orthodox teaching was different from the Protestant teaching, that "non-denominational" meeting became Protestant quickly, the Orthodox position was either a) one opinion among several, or b) wrong. After a while, I thought I was wasting my time there, and decided against attending (but how many others thought "Well, we're all using the same Bible, so how could they be wrong?). I saw a Catholic graduate only to announce plans to go to "Bible College", and an Orthodox girl who didn't get anything out of the Divine Liturgy (I think I asked her "Is Jesus not enough?"). I don't blame these two individuals: they were earnestly seeking out the Lord, and the people who were reaching out to them effectively were not their priests or peers grounded in their own tradition, but Evangelicals, Fundamentalists, and even Pentecostals.
Just because their (and my) parents' generation is older doesn't make them less susceptible to such dangers. I would argue that they are probably in more danger. The gentleman I referred to in my last post was in his forties, but I know of people in their fifties who think we should not deny anyone Communion because "God loves everyone", and people in their sixties who think that God abandoned Jesus on the Cross because Jesus literally became sin, and this was abhorrent to the Father. I promise you they didn't get these ideas from their participation in Orthodox-led prayer meetings. It is from listening to the wrong teachers, be they on TV or through their books (they read the Scriptures, but how many of our older people have read the Church Fathers? I know of many who have read Protestant authors, however), and from attending prayer meetings, "healing services", etc. where, for all the fruits that may be present, heterodoxy is preached as "Bible truth".
I agree wholeheartedly with you, Paul, that we must do so much more to reach out to our people (and to those outside of the Orthodox Church) with the truth of our faith. But we must also make clear to them what is to be avoided, and if forbidding, through some disciplinary means, them from attending these functions proves effective in making the point, we should not hesitate to do it in conjunction with providing positive means to encourage their spiritual development. It's not "being mean", it is being a loving parent, and that is what our Mother the Church is.