@BagpussSaggyOldClothCat I did the Beat workshop on Christmas and found it helpful.
DD and I have been talking through Christmas and I've been coaching her about what it might be like and what a plan of the day could be that she's not anxious about.
This was an open discussion about - what bits of Christmas are most important and is she most looking forward to (morning walk with the dog in a Christmas jumper, present opening round the tree, family games) and what is causing anxiety (being around family, the Christmas dinner).
We've worked through a schedule of the day incorporating and focussing on the bits she's looking forward to, then we have an ideal scenario for the difficult bits, but plan b (and c) if it's too much eg ideal scenario is she eats her (modified) Christmas dinner with us at the table, and has a smoothie for dessert. Plan b is food upstairs first and smoothie with everyone, plan c is food and smoothie before us and then she takes charge of table games during dinner. She wants to do plan A, but having plan b and c written down is reducing her anxiety about it.
It made a big different to her as she had built lots of stuff up in her head and assumed lots of expectations (eg we would want her to be around everyone all the time, she would have to eat a full Christmas dinner at the table no excuses)