Grammar question from U.S Citizen test?

Name two national U.S holidays - New Year's Day - Martin Luther King. Jr. Day - Presidents' Day - Memorial Day - Independence Day - Labor Day - Columbus Day - Veterans Day - Thanksgiving - Christmas ------------------------------------- 1. why Thanksgiving and Christmas... show more Name two national U.S holidays

- New Year's Day

- Martin Luther King. Jr. Day

- Presidents' Day

- Memorial Day

- Independence Day

- Labor Day

- Columbus Day

- Veterans Day

- Thanksgiving

- Christmas

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1. why Thanksgiving and Christmas does not include the word Day?

2. why New Year's Day and Presidents' Day have apostrophe and the rest of the days do not have apostrophies?
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