Chrismas前加什么介词

at christmas
on christmas eve

What will they do on Christmas Eve?
他们在圣诞夜将做什么事？

Christmas card, greetings card sent to friends at Christmas 圣诞卡.
Adapt from:牛津高阶英汉双解词典

on christmas 在圣诞节 节日钱都用介词on

at christmas eve在圣诞节前夕

用at