Some key elements could be the birth of Jesus in Bethlehem. Include the journey of Mary and Joseph, like how they had to travel while Mary was pregnant. Also, mention the stable where Jesus was born, and the animals there. And don't forget the three wise men who followed the star to bring gifts.
Well, for a script for kids to read the Christmas story, it's important to start with the announcement of Jesus' coming. Angels are a big part. So, you can have an angel appear to Mary to tell her she'll have a special baby. Then, there's the census that made Joseph and Mary travel. When they got to Bethlehem and couldn't find a place in the inn, the stable became the birthplace. The shepherds who were visited by angels and then came to see the baby Jesus are also important parts.