My youngest (now 18) is autistic, dh and one of the older siblings probably also are. Over the years we have developed a formula which works for us, and balances the needs of both ND and NT family members. The formula barely changes from year to year. When the dc were younger, part of the run up to the festive season of CE to NYD was verbally reviewing what we would be doing. We repeated the reviews over several days, building up a picture of the week. We didn't need to do visuals or social stories, but those may also be helpful.
We have the same routines as in First/Next/Then etc, but never fix actual times for each stage until very close to that stage. Apart from stockings.
Stockings were opened in their bedrooms at any time from 6am. From 7am they were allowed to leave their rooms. Presents were, and still are, opened all together in the living room. Each person takes a turn delivering an item to everyone else, and we open them one at a time.
This may sound massively restricting, but it prevents overload. It allows each person to interact with their gift without being rushed - in fact, that's another of our rules: put on anything that can be worn, read something aloud out of any book, play with any game, if possible. It also allows people to take time out if they need to re-regulate or are disappointed. We return to present opening several times in the day. Present opening takes as long as it takes, sometimes even into the new year.
Every aspect of the day has its place in a pattern that is repeated every year. The routine is as much part of our festive traditions as putting up the tree and laying out the stockings.
The tree is another issue. Decorations go up slowly, over the course of several days, with the dcs' help, and the tree goes up once school is out. Again, it's about a slow build-up that involves the dc so that nothing is overwhelming.
We don't do exciting anticipation. I think that's the only aspect that the dc miss, but OTOH there's plenty of that outside home.
Hope some of these ideas are helpful to you, and you don't end up losing your Christmas.