There used to be the regular Conclave of Quel’Thalas that would happen, they were nearly always well attended and were popular.
Could be worth reaching out to Itharie and seeing if she’d maybe be able to help in some way 
There’s plenty of us all who’ve attended past ones who could help with what was done in the past, but the experts would be the ones who hosted it previously, the rp it created before with ic meet ups before getting an official invitation helped to create a bit of an exclusive buzz about it (and the listening to gossip while queuing to go into the Hall of Blood was always a bit of a bonus).
Edit: realised your post was about velf and helf also - not just belfs alone