This is the 1814th most frequent Chinese word.
萬聖節
Halloween.
In this sentence, 萬聖節 denotes the holiday of Halloween, and it plays the role of specifying the occasion during which the described action takes place.
我喜歡在萬聖節裝扮成各種有趣的角色。
I like dressing up as various interesting characters during Halloween.
Here, 萬聖節 specifies the day being discussed for activities and feelings associated with it, acting as the subject in the sentence.
萬聖節是孩子們特別期待的一天，因為他們可以得到很多糖果。
Halloween is a day that children particularly look forward to because they can receive a lot of candy.
The phrase 萬聖節前夕 extends the meaning of 萬聖節 to refer to its eve, and it sets the temporal context for the event described.