What is the ruling on female colleagues attending a birthday party for a male colleague and bringing him gifts, and what are the limits of interaction between colleagues who are not Mahrams?

Celebrating Christmas is forbidden, and it is not permissible to participate in it in any way, whether by attending or giving gifts, because attending a place of abomination is itself an abomination, unless there is a legitimate reason, such as denouncing it. If the celebration involves the mixing of men and women, this is another abomination and a means to corruption. The statement that a non-mahram man is like a brother is a false assertion, serving only to beautify evil. Sisters should fear Allah and beware of the causes of fitnah.