Thanksgiving is celebrated on the fourth Thursday of November in the United States to commemorate the Pilgrims sharing a harvest feast with Native Americans in 1621. Christmas is celebrated on December 25th and involves decorating houses, leaving milk and cookies for Santa, and receiving gifts. It commemorates the birth of Jesus Christ. New Year's is celebrated on January 1st with special events, parties, kisses at midnight, and the appearance of the first baby of the year in newspapers and on TV.