"I’ve heard from a friend"
Why didn't you call the school yourself and ask them yourself?
Why would you start a thread here that you knew very well had the reasonable prospect of becoming inflammatory?
Inflammatory.
As if anyone needed that; other than to get the hackles up, and the blood pumping?
You say the word "Christmas" has been "banned" at your child's school.
"Banned" is a very powerful word, which implies punishment by school authorities if the word is spoken or written.
There are no schools in the U.K. where the word "Christmas" has been "banned", and I think OP knows this.
This is a 'pot stirring' post.
In many places where there are people who celebrate different religions, with it's attendant festivals and traditions, the aim is shifting toward awareness of this, and inclusivity toward all religions and festivals.
There is nothing wrong with calling a festival that occurs in the month of December a " Winter Fest" "Warming Festival" "Fun Fayre" etc... it is fun for all, supposedly, and inclusive to all.
Nothing religious about it, in fact, many of these office parties that happen in November/December in the name of "Christmas" have more to do with excess celebrating, in all aspects of the word, and nothing to do with the teachings of Christ.
I'm sure when the school's Festival in December rolls out, there will be all the usual trappings; glitter, balloons, candy, streamers etc....so no Christian child will be offended and children of other faiths will have just as nice a time without feeling left out.
That is the true meaning for the festival, and of Christ's teaching too.