The Pylians are having a feast to honor Poseidon upon Telemachus's arrival at Nestor's palace.
The Pylians are having a feast in honor of Poseidon when Telemachus arrives at Nestor's palace because it is customary to honor gods when they visit. In Book III of the text, it is mentioned that the people of Pylos gather to offer sacrifices to Neptune, known as Poseidon in Greek mythology. Additionally, Nestor takes his role as king seriously and frequently honors the gods for the sake of his people.
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