The following threads may be considered "live" for FoG:
Fall of Gondolin Part 3 Structure,
Mechanical Monsters at the Fall of Gondolin, and
Rog: Canonical Elvish or No?.
Also, the beginnings of the Ruin of Doriath project:
Ruin of Doriath.
Those are the threads in which there has been recent discussion. But that certainly doesn't mean they're the only relevant threads or the only threads you're allowed to post in.