Point out several incidents that establish an atmosphere of foreboding or doom in Books 17-20 of Homer's Odyssey.

Homer prepares the audience for the death and destruction
that occurs in Odyssey 22 in a couple of instances in Books
17-20.

Early in Book 17, Theoclymenus predicts that
Odysseus is already nearby, is learning of the unjust behavior of the suitors, and his
preparing to take vengeance on them.

Also in Book 17, when
Melanthius tries to knock Odysseus from the path, Eumaeus prays for the return of
Odysseus and punishment for Melanthius. Indeed, both those prayers are eventually
answered.

In Odyssey 18, Odysseus, disguised as a beggar
warns Amphinomus that Odysseus is near and that he will punish the
suitors:

I
tell you, he is near, and may some god prompt you homewards, so you need not face him on
his return. He and the Suitors will not part without bloodshed, I think, once he is
under his own roof. (A.S. Kline
translation)

In
Odyssey 19, Penelope has a dream about an eagle that kills 20
geese. The disguised Odysseus, who is listening to Penelope relate this dream, tells her
that it is clearly a prediction that Odysseus is going to destroy the
suitors.

Finally, in Book 20, we hear that Zeus thunders
when the sky is completely clear and that one of the servant women, upon hearing this,
prays for the final day of the Suitors in the palace:

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It must be an omen you send someone. Make even my
words come true. Today let the Suitors delight in feasting for the very last time in
Odysseus’ palace. Let those who have bowed my limbs in hard labour grinding barley, now
eat their last meal.’ (A.S. Kline
translation)