It depends on what follows instructors.
Plural
Your parents met with your instructors.
Possessive Plural
Your instructors' expectations included that every student will succeed.
This depends on the rest of the sentence E.g. Your instructors are happy with your progress or Your instructor's watch has gone missing, have you seen it? or Your instructors' meeting was a waste of time as none of them brought their notes
Yes, the phrase "This Year's Honorees" does need an apostrophe. The apostrophe indicates possession or belonging, showing that the honorees belong to or are associated with "This Year."
Yes as it is the possessive form. As the phrase is referring to just one of the names in the partnership, the apostrophe should be placed thus:- PARTNER'S NAME If instead you had been asking about all of the names in the partnership, the apostrophe should be placed thus:- PARTNERS' NAMES
Yes. McCain has ownership over his place of employment. An apostrophe is required.
If the '24' in question is a player on a team wearing the number 24 then yes, you need an apostrophe in "24's Mom." The apostrophe in that position indicates the 'Mom' belongs to 24.
No, there is no apostrophe in the phrase "21st century."
I am does not need an apostrophe. It is only when you make it into a contraction by dropping the a that you need the apostrophe. It becomes I'm in that situation.
No. The Cannons doesn't need an apostrophe.
No, Christmas Eve does not need an apostrophe.
No, the phrase "Fuzzy Farmers Market" does not need an apostrophe. The term "Farmers Market" is a noun used in a descriptive manner to refer to a market held by farmers. The phrase "Fuzzy" is simply an adjective describing the market, so no apostrophe is required.
The phrase "Here's to Harry" does require an apostrophe in "here's." This is because "here's" is a contraction of two different words, here and is, where the apostrophe takes the place of the missing space and the missing i from is. The "here" that "is" (being offered) to Harry in this phrase is not explicitly stated but is understood by the context to be, for example, an honoring by a "toast." Without the apostrophe, we would have heres, which is not the word meant in this phrase. (Heres is actually a legal term meaning "an heir.")
Glasses' rim.