WanChai73,
I agree that we should all get along, but even while "getting along" there's always going to be boundaries established, maintained and respected. While NA, AA, and other 12 step fellowships enjoy a relationship of cooperation and mutual admiration, each has it's own primary purpose and singleness of purpose.
I, personally, would think it's okay to mention if your group allows announcements of non-NA events or concerns. In my area, we don't announce anything that isn't NA related in our meetings. We have enough stuff going on within the fellowship that needs our support (area, region and world).
Have you read Tradition 6 or 7? What does your sponsor think about this?