Are there any celebrations or festivals for Poseidon?

Yes, ancient Greeks celebrated festivals in honor of Poseidon, the god of the sea. One of the most notable was the Panathenaic Festival in Athens, which included athletic competitions and cultural events. Additionally, the Isthmian Games, held in Corinth every two years, were dedicated to Poseidon and featured athletic contests and sacrifices in his honor. These celebrations reflected his importance in Greek mythology and maritime culture.