That's a really tough one because it is going to look wrong no matter what you do. There is no rule for this expression all by itself.
It's a common practice to insert an apostrophe in certain kinds of plurals--not ordinary words but special cases, such as with letters and numbers (she got all A's; my phone number has three 4's in it). Publishers have style rules that tell editors whether or not to use apostrophes in plurals like these. But a general style rule is not going to offer guidance in this very special case.
Here, you might want a separator in do's, but you can see that two apostrophes in don't's really look strange.
I have actually seen all three solutions used in published material:
dos and don'ts
do's and don't's
do's and don'ts
My opinion is that having the separator is more important than avoiding the double apostrophe, so I would choose the second one. But it is a matter of opinion. A case can be made for each. *Technically speaking, it's punctuated correctly in the opening question. "Dos" and "Don'ts" are plurals, which don't take an apostrophe before the letter s. Don't is a contraction, which substitutes an apostrophe for the missing 'o' I would go for option 1, capitalized and wrapped in double quotes:
"Jack had never roomed before and was getting a crash course in the "Dos and Don'ts" of communal living"
The informal use of the apostrophe to form certain plurals (such as do's) cannot be similarly used for don't. The competing forms are:dos and don'ts - where the plural dos can appear unusualdo's and don'ts - which is clearer but may be deemed technically incorrect(Using dos and donts is a third option because the intent is obvious despite the spellings.)
No, there is no apostrophe in the phrase "21st century."
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.")
The apostrophe in O'Neal and O'Sullivan is actually a mark of elision -- an omission of one or more sounds in a word or phrase.
Because that is short for 'of the clock', a phrase which is not used anymore.
chew yer food
be careful hens and broons
A major DO for Baquacil is chemically cleaning the filter MONTHLY.
keep off the grass
do not chew or eat when using telophone
The do's should get apieca of cloth and
MADE Presents Kiss and Tell The Dos and Donts of Dating - 2010 TV was released on: USA: 1 May 2010
Chronicles of Comic Con - 2012 Comic Con Dos and Donts 1-1 was released on: USA: 10 July 2012
The informal use of the apostrophe to form certain plurals (such as do's) cannot be similarly used for don't. The competing forms are:dos and don'ts - where the plural dos can appear unusualdo's and don'ts - which is clearer but may be deemed technically incorrect(Using dos and donts is a third option because the intent is obvious despite the spellings.)
No, there is no apostrophe in the phrase "21st century."
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."
Ralph Rogers has written: 'Dos and donts of radio writing' -- subject- s -: Authorship, Radio broadcasting