Names of holidays are proper nouns and must be capitalized.
Here are some of the holidays that are proper nouns:
Christmas Day
New Year’s Day
Valentine’s Day
Mother’s Day
Memorial Day
Father’s Day
Independence Day
Labor Day
Veteran’s Day
Thanksgiving Day
Names of holidays are always proper nouns and must be capitalized.
▶It’s your turn. Find the words in this sentence that should be capitalized. Bob sent me a card on valentine’s day. That wasn’t too hard, was it?