How about this:

Harry has a near-death experience on Halloween.
While there, he receives insight, tips, instructions from many.
The host -- everyone who has ever been to Hogwarts--
"The Hogwarts Hallows."
Then he spends the next few months following these tips.

People he knows will be right up-front in this host.
Lily, James, Sirius, Cedric, Amelia Bones, Karkaroff, Aragog?
But Dumbledore will not be among them because...