The Ancient Greeks did not celebrate Christmas. Christmas is the commemoration of the Birth of Jesus and, as Jesus had not been born in Ancient Greek times, it was celebrated. Christianity had not been founded at this time.
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For the same reason we celebrate Christmas and Easter; to honor the gods that they felt influenced their world.
Anubis.
Trojan Horse was hollow and some of the Greeks were hidden inside. The Trojans thought the Greeks had left. So they demolished part of the walls of Troy and took the Trojan horse inside the city. They had a feast to celebrate their enemies departure and when they slept the Greeks came out.
mostly Bread, fruits even though they were rare
Primarily Roman and Greek (via Rome).