应该是 at the end of.
usually,Eve is pretty much only used with Christmas.
Eve一般只用在Christmas后面
New Year's Day.should always be capitalized
新年,永远都应该大写
usually,eve is not used with Halloween...
eve一般不和Halloween用在一起
And yes,on is pretty much always used.
对,节日前面,一般加on.当你要说,在那天你干什么了
usually,we don't use articles in front of holidays
一般,节日前面不用冠词
i've been living in a english-speaking country for a long time,so i know the answers to your questions...