1.谈到圣诞节、新年、复活节和感恩节，如指整个节日，就用at。如：

We often go carolling at Christmas. 我们在圣诞节常去唱颂歌。

We’re having the roof repaired at Easter. 我们要在复活节期间找人把房顶修一修。

Some children make lanterns out of pumpkins at Hallowe’en. 有些儿童在万圣节前夕用南瓜做灯笼。

2.但如果指节日中的某一天，就用on。如：

Come and see us on Christmas Day. 圣诞节那一天来玩儿吧。

What are you doing on Easter Monday? 复活节第二天你干什么?

3.表示周末时，英国人说at the weekend，而美国人则说on the weekend。如：

What did you do at the weekend? 你周末干什么了?

He likes to go climbing at weekends. 他喜欢在周末做登山运动。

They like to go ballooning at weekends. 他们周末喜欢乘气球玩。

4.当然，若强调是在整个期间，也可用during等。如：

Five thousand people were flown to Paris during the Easter weekend. 在复活节的周末有五千人乘飞机去巴黎。