[Infographic provided by Grammar.net]
Short Answer: Yes
Long Answer: Halloween is a holiday and proper noun, so it should be capitalized according to title capitalization rules.
While Halloween is a holiday and proper noun, the word “night” right afterward is not capitalized in a sentence, but will be capitalized in a title if you are using any of the styles in title case such as when referring to the movie “Halloween Night.”
that Halloween actually comes from the original phrase “All Hallows’ Even” referring to the evening before All Hallows’ Day (Nov. 1). According to Grammar Girl,
The “all” and “s” were dropped, “hallows’ ” and “even” became a closed compound, and the apostrophe took the place of the “v,” giving us “Hallowe’en”—just one of many transitional spellings along the way to “Halloween,” which the Oxford English Dictionary shows as first appearing in 1786. Other spellings before “Halloween” included “Hallow-e’en,” “Alhollon Eue,” and “Halhalon evyn.”
If you want to, you can still refer to Halloween as Hallowe’en to give your Halloween party an olde-timey feeling. It’s up to you!
Featured image from tplusquotes.com