Answer:
He was at the the great council talking about the fighting of the Necromancer.
Step-by-step explanation:
J. R. R. Tolkien's "The Hobbit" is a fantasy novel as part of the Lord of the Rings Series. The story revolves around elves, hobbits, dwarves, monsters, and sorcerers.
In Chapter 19 of the text, Bilbo learned that the real reason Gandalf left them before they entered the forest of Mirkwood was to be with the great council of wizards, trying to fight the necromancer. This necromancer had returned to destroy the land and take it for himself, which was the evil presence in the whole story.