The event is being stalled by the dolyaks not moving. https://imgur.com/a/o6mc32p
Living World Season 2 - Chapter 3 The Dragon's Reach Part 1 - Summit Invitations
The Dolyaks do not move and enemies come endlessly. The event never progresses (tried for over an hour). I tried zoning to a different map and re-entering. Went to GH and came back. Exited game and restarted. Joined a different group to try to get into a different instance. Nothing works.
yeah there are a few people including myself besiged by this nasty little bug
There's a fix for this in an upcoming update.