This page about a Christmas special or an episode from a television series with a Christmas theme is in need of a longer synopsis. You can help the Christmas Special Wiki by expanding this synopsis.
Mr. Percival is holding a special Christmas party. All the narrow gauge engines are to deliver party supplies to his house. Freddie is at the wharf with his friend Colin, who has never been to a party because he is fixed in place. Freddie has an idea to hold the party at the wharf so Colin can be there too. Freddie tries to reorganize everything, but in doing so the party nearly doesn't happen. Freddie sees Mr. Percival and confesses what has happened. Freddie learns that he should have asked first and is allowed to go and put everything right.