"Christmas Comes But Once a Year" is a popular phrase that refers to the annual celebration of the birth of Jesus Christ. It is a time when families come together, exchange gifts, and enjoy traditional treats and meals. To convey the same sentiment, some other synonyms are "It's a once in a year occurrence," "A one-time celebration," "A yearly festival," "A singular event," or "An annual festivity." These phrases can be used to describe any occasion that happens only once a year. Regardless of the words used, Christmas remains a special time of year, full of joy, love, and merriment.