Bilbo has been taken to Goblin-town, and now Celeblír has a plan for getting inside.
Celeblír plans to cause a distraction that will let you access Goblin-town's main gate.
Celeblír will distract the goblins, drawing them away from the entrance to Goblin-town. You must avoid detection by the goblins until he lures them away!
The goblins will surely have hidden a spare key to the gate somewhere outside Goblin-town.
With the spare key in your possession, you can now unlock the gate to Goblin-town.
Celeblír has returned, and without his goblin-pursuers.