yes, surey!
no
In the salutation "Good day to you," you only need to capitalize the first word, "Good."
The phrase "Columbus Day" is the full name of a holiday. Therefore, both words should be capitalized.
No it doesn't require to be capitalized.
It should be --- Earth Day, Planet Earth.
Yes, you always capitalize a day of the week.
Yes, "Game Day" should be capitalized when referring to a specific event or occasion.
Yes, you should capitalize "About" in a title.
Yes, it should be capitalized because it is a proper noun
Yes, "Day" should be capitalized in Mother's Day as it is a specific holiday and part of the proper noun.
Since 'day' is a common noun, you should only capitalize it if at the start of the sentence or part of a name/title (Eg: Graduation Day 2013).
do you capitalize every word in veterans day ceremony