Chicago makes it: A TV wedding includes two "I dos". or A TV wedding includes two I do s. I don't like it, either.
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Chicago makes it:
A TV wedding includes two "I dos".
or
A TV wedding includes two I dos.
I don't like it, either. Note the roman "s" at the end on the second one and the consequent inconsistency in putting the "s" inside the quotation marks in the first.
At the group wedding, there were many "I do"s to be heard and not a single "I don't."
It seems to me much cleaner and clearer than "I dos" because the -s on "do" just makes that one word a misspelling. The quotation marks indicate that the phrase is a literal quotation, or speech.