You mean foreign grad students who don't have anywhere to go that night? A few years ago, I would have come
I think you're probably not going to find hired help, except perhaps your neighbor high schoolers who don't celebrate Christmas, or don't do Christmas Eve at any rate.
What you should do is streamline the whole production:
1. Prep as much as you can in advance.
2. Buy what you can't make.
3. Ask your family and ILs for specific help, so that people don't mill around getting in your way.
4. Have a designated person to entertain/manage the kids.
5. And above all, lower your expectations!
(6. And perhaps, do extra yoga, glass of wine, xanax, before the big stress. Whatever helps.)