Many children feel anxious if they don't know what to expect from a new situation. Providing a visual "itinerary" of the upcoming events can help them understand and increase their comfort level.
Visitors, especially near the holidays, may cause anxiety for some people. This answer provides a number of strategies that may help reduce anxiety and promote positive experiences.
Some children can become over-stimulated or agitated by their surroundings and benefit from increased structure and a controlled environment. This answer provides suggestions to help decrease your child's difficult behaviors by making some changes to the home environment.