No matter how prepared we are there always seems to be something that goes wrong. These moments are what Christmas memories are made of so don't worry about them.
One year when I was growing up our oven stopped working and we ended up making our Christmas eve dinner over at a neighbors!
Another year we were about an hour away from my in-laws home when our toddler NEEDED TO GO! We were driving through farm land and miraculously there was a port-a-potty at the side of the road. Not only was it open and clean but there was toilet paper in it.