@Noimaginationforaun I am really sorry to hear that you didnt get much Support from the xmas board here.
My AS (6) will be having his second xmas with me this year. We will be having a very minimal xmas and virtually on our own again after last year's Lockdown Xmas.
My son can't even cope with family gatherings atm - Sensory issues re noise, lots of people, food, plus lots of Attachment issues esp due to Lockdown really limiting seeing family in his First year here. So various xmas get togethers with the family is a no goer. Plus he needs his Routine staying the same.
We are going to my parents for a very low key xmas lunch, open a couple of presents and then go home. So at least I get a xmas lunch this year ! He will take a normal day to day cold lunch with him and will probably eat it on the floor watching tv !
Last xmas we had a tree and some decorations at home and he has made it very clear that he doesn't want them. He's thrilled with just having a felt xmas tree and an advent calendar this year. He says it will mean he has less Wobbles.
He has asked to see the xmas lights in the daytime this year as lights in the dark hurt him.
He has big anxiety about knowing what presents he's getting and of people coming into the house. He was petrified at the thought of Santa coming into the house when we are asleep. He has seen all his presents and is helping to wrap them up. I said that Father Xmas made them and that he asked Amazon to deliver them to us 
Next xmas we will hopefully be able to do a bit more with the family.
I had really prepared for last xmas and did lots of very low key things but... I realised that for him he needed things to be REALLY low key as his many Sensory & Attachment issues became more apparent.
Obviously each family will be different but I know that there are lots of similar issues that Adopters have to deal with.
I found the first year... with all the firsts to be such a learning curve.
I think the most important thing is to do what your child/ren Need. And to stand firm in what you are doing as non Adopters often don't understand just how overwhelming xmas and the whole build up is for our kids.
I expect that there will be more Threads here re xmas in the coming weeks !
Take care and I hope everything goes well.