There are many festivals, religious celebrations and holidays that can be celebrated within your setting, that offer opportunities for children to learn.
This simple resource from TES looks at the origins of Halloween and provides useful information that may help you take children's learning beyond the usual pumpkin carving and dressing up.
Teach Early Years considers ways to ensure you have a child led Christmas in your setting.
While written in America, many of the concerns raised around the Christmas Curriculum in this article from Tolerance.org are directly relatable to the UK