Assalam O Alaikum
Ok, here they are :
Sahih Bukhari Volume 4, Book 56, Number 662:
Narrated Abu Said:
The Prophet said, “You will follow the wrong ways, of your predecessors so completely and literally that if they should go into the hole of a mastigure, you too will go there.” We said, “O Allah’s Apostle! Do you mean the Jews and the Christians?” He replied, “Whom else?” (Meaning, of course, the Jews and the Christians.)
Sahih Bukhari Volume 4, Book 56, Number 668:
Narrated Abu Huraira:
Allah’s Apostle said, “The Jews and the Christians do not dye (their grey hair), so you shall do the opposite of what they do (i.e. dye your grey hair and beards).”
The above two ahadiths tells us that we should not follow Christians and Jews.
NEW YEAR PARTY / CHRISTMAS PARTIES are one of them, please don’t follow the people with whome Allah SWT is not happy and Prophet SAW has stopped us to follow them.
As simple as that.
Assalam O Alaikum