Christmas is not a traditional Chinese holiday, but it's increasingly celebrated in cities as a commercial and social event. 平安夜 (Píng'ānyè, Christmas Eve) is when young people exchange apples (苹果 píngguǒ), because 平安 sounds like 苹.
memory
圣 (holy) + 诞 (birth) = 'holy birth' — referring to the birth of Christ.
