Does the word dinner in Thanksgiving dinner have to be capitalized?

In general, the Word "dinner" in "Thanksgiving dinner" does not need to be capitalized unless it is the first Word in a sentence. However, if you are referring to a specific event or formal title, such as "The Annual Thanksgiving Dinner," then it would be appropriate to capitalize it. Ultimately, the capitalization of "dinner" in "Thanksgiving dinner" depends on the context and style guide being followed.