Are you back in Atlanta?
As far as I know, there are no restrictions to night riding Conyers. Just look out for those rocks.
Also, FYI if you haven't been out there in a while, there is a new section of "beginner" trail. As you start on Steeple chase side, veer right towards the road when you get to the first gas line clearing. It is about 1mile of trail to get you warmed up and it dumps you back at the beginning of Steeple chase.