No, you don't have to.
Capitalize government in the middle of the sentence if you're referring to a specific government (Federal Government, State Government, etc) or if you're referring to a course about government (I'm going to be late for Government!).Capitalize civil rights in the middle of a sentence only if you're referring to the Civil Rights Movement.
No it shouldn't be capitalized.
You do not capitalize chickenpox in a sentence. The exception is if the word is the first in the sentence.
No, you do not capitalize "first birthday" in a sentence.
You only capitalize 'deceased' if it is at the start of a sentence.
Yes, you should capitalize the letter after a comma in a sentence.
Yes, you should capitalize the word after a comma in a sentence.
No, 'government contract' doesn't require to be capitalized.
Yes, you always capitalize a day of the week.
You should not capitalize a sentence fragment following a colon.
Yes, you should capitalize the first letter after a comma in a sentence.
No you do not capitalize artist in a sentence