Christmas

Christmas is an annual festival commemorating the birth of Jesus Christ, observed primarily on December 25 as a religious and cultural celebration among billions of people around the world.

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Rebecca Masterton, Dr Rebecca Masterton graduated with a BA in Japanese Language and Literature; an MA in Comparative East Asian and African Literature and a PhD in Islamic literature of West Africa. She has been... Answered 3 years ago

According to Ayatollah al-Sistani, if having the tree promotes another religion, then it is not permissible. Actually the origins of the Christmas tree are pre-Christian. The practice of having a Christmas tree was brought from Germany to England by Prince Albert, I believe, in the nineteenth century. Nowadays there is the ethical issue of buying a living tree and then chucking it out after a few days, which leads to israf (waste), which is not permissible in Islam. Sometimes previously wild woodland is replaced by the monoculture of fir tree growing. 

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Amina Inloes, Amina Inloes is originally from the US and has a PhD in Islamic Studies from the University of Exeter on Shi'a hadith. She is the program leader for the MA Islamic Studies program at the... Answer updated 6 years ago

Yes (as long as it is halal, and as long as you follow a scholar allowing food from Ahl al-Kitab). Keep in mind, in some cultures, it is common to cook and bake with alcohol especially during the holidays, so you may want to be sure there is no alcohol in the food.
 

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Sayyed Muhammad Husaini Ragheb, Sayyed Muhammad Husaini Ragheb has a BA in Law from Guilan University, Iran and has also undertaken Hawzah studies in Qom. He used to be a Cultural Affairs director of Ethics Group of Al-Mustafa... Answered 6 years ago
Sayyed Mohammad Al-Musawi, Sayyed Mohammad al-Musawi is originally from Iraq and heads up the World Ahlul Bayt Islamic League in London. Other than being involved in various humanitarian projects, he frequently responds to... Answered 6 years ago

Yes it is allowed to see Christmas lights as far as you do not take part in any non Muslim religious practice.

Wassalam.